EB was applied while departing station with DIR and DMI illuminated and TIMS showed Front M2 car 'A3 ' train doors status lost. Reset EB - ok. Station staff (RFP ) checked and confirmed no abnormalities on the train doors. ~~~~~ EB was applied while departing station with DIR and DMI illuminated and TIMS showed Front M2 2660 car 'A3' train doors status lost. Reset EB - ok.Station staff (RFP) checked and confirmed no abnormalities on the train doors.  #2660 A3 CLE and DOM Fault Conducted door cyclic test, unable to duplicate fault. From Fault Trace, CLE and DOM fault occured twice at 1654hrs and 1709hrs. Checked Signal TOD, door lost status occured at same timing. From fault trace, door is proven closed for both occurance (door gap 0mm, CLE not registered) . However, after a few seconds, door gap will increase slightly  and close afterwards to clear fault. DOM fault occurs due to this gap while train moving Checked the door lock switch rigging, ok. Checked door mating strip top/middle/bottom (64.7/64.5/64.9), out of criteria. Postulate that this causes the door lock pin to be unable to fully insert so door can open and close back during movement. Adjusted to (63.7/64/63.7) Other findings: Door resistance 8.5kgf. Found two rollers at LHS door to be rotating out of axis, replaced. After servicing door and replacing door roller, door ressitance 4.2kgf Door cyclic test, ok. JOB Done by BSD 6/1/2021