Date: 201506
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Aircraft: B737-800
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Parked; Taxi
Reporter organization: Air Carrier
Reporter function: Other / Unknown
Reporter qualification: Maintenance Powerplant; Maintenance Airframe
Human factors: Troubleshooting; Situational Awareness; Confusion; Communication Breakdown
Second reporter function: Other / Unknown
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew; Person Maintenance
When detected: Taxi
Result: Flight Crew Returned To Gate; General Flight Cancelled / Delayed; General Maintenance Action
Contributing factors: Aircraft; Human Factors; Procedure
Primary problem: Human Factors

Narrative: The crew from [aircraft X] called over the aircraft radio enroute to ZZZ1. They said that his Blue Overhead Fuel Valve light was illuminated. I asked if the engine was still running; they said yes. I asked if the engine was operating within normal parameters; they said yes. I asked if there was any engine fluctuation; they said no. I told him that it appeared to be an indication issue. The crew agreed and continued the flight to ZZZ1.  I completed a Turnover Report in the Maintenance Control turnover log that the Overhead Blue Engine valve light was illuminated. Upon landing in ZZZ1; the [flight] crew created a discrepancy that it was the Spar Valve light that had illuminated in flight. I had believed that the crew was discussing that it was the Engine Valve light that was illuminating. Because of this belief; I had even discussed with the crew there would be a possibility MEL'ing valve in ZZZ1. I turned this information over to the on-coming Maintenance Control shift. The aircraft Engine Valve was MEL'd in ZZZ1 by the on-coming shift. The aircraft flew to ZZZ2 where company Maintenance determined that the MEL may have been incorrectly applied. ZZZ2 Maintenance corrected the Spar valve problem and cleared the Engine Valve MEL. ZZZ2 Maintenance noted that the discrepancy and the resolution did not balance.My belief had been that the crew had been seeing an Engine Valve fault. I turned this information over to the on-coming shift. The crew wrote that they had a Spar Valve fault. The on-coming shift used my turnover report to apply an MEL that may have not been correct. ZZZ2 Maintenance replaced the Spar valve and cleared the Engine valve MEL. Ensure that discrepancies and resolutions balance.


Second narrative: Aircraft had pilot report (P/R) inbound to ZZZ1 for # 2 Eng Spar valve Blue light illum in flight. I contacted ZZZ1 Maintenance & told Tech we would MEL the light. Tech read me the log page but I did not hear him say it was the Spar valve the crew had written up. I instructed the tech to accomplish the procedures for the MEL I wanted to apply 73-10. Tech accomplished them. There was a communication problem with which c/b needed to be pulled & collared and the location of it. The MEL for the 'Eng. valve light' # 73-10' was completed. Initially I had the tech collar the incorrect breaker which was rectified later. After the acft arrived in ZZZ2 the techs called ZZZ Maintenance Control and informed them of the error.At start of shift; received [Turnover] tie-in that 'Eng. valve light illum bright.' My first thought was a Cowl Anti-Ice light was on. My co-worker told me to look again at the tie-in and I read that it was a Eng. valve lt. I pulled up the MEL for that light (not uncommon for it to occur) and contacted the tech in ZZZ1. After the acft landed the tech read the P/R to me. I missed the tech telling me it was the Spar valve & not the Eng valve. I proceeded to have the tech MEL the Eng valve as stated above. We had a discussion while filling out the book about circuit breaker (C/B) location. At that time I had the tech collar the wrong breaker at my direction. This error was discovered later & amended to the correct c/b for that MEL.While Tech in ZZZ1 was accomplishing the MEL I was answering calls from other techs & helping with a window heat in ZZZ3 & in ZZZ4 with a piece of debris in a panel in front of the elevator. Techs in ZZZ2  trouble shot/s & repaired the system originally written up. Reversed the MEL procedures & removed the MEL.  I didn't look at the log page picture the Tech sent from ZZZ1 till the next day on my way to work. I make it a priority to look at them as soon as possible. Maintenance Controller. Evening [shift]. Workplace interruptions during task.


Synopsis: Two Maintenance Controllers; an Aircraft Maintenance Technician (AMT) and a Captain describe their involvement with a reported # 2 Engine Fuel Spar Valve Overhead Blue light fault that was miscommunicated and deferred as an Engine Valve Blue fault light on a B737-800 aircraft. A downline Maintenance Station noted that the original discrepancy and the resolution did not match. Spar valve was replaced and Engine Valve MEL cleared.