TC reported air-con fault. Unable to reset. TC changed end at MSP checked and confirmed that rear ca rset #1 air-con faulty. Reset - ok. Car was cooling. ~~~~~ TC reported air-con fault. Unable to reset. TC changed end at MSP checked and confirmed that rear car 3531 set #1 air-con faulty. Reset - ok. Car was cooling. Depot to check 3531 & 2531 aircon operation.  #3531 Ac1-1 freon low, charge freon ok, CCU check no leak and Ac2-1 CCU No Compression, Noti to HM follow up CCU c/o. #2531 Ac1-1 and 1-2 zero freon, found CCU Lp coupling heavy freon leake, replace both Lp coupling copper Ring and function test ok. Side finding #1531 Ac2-1 CCU choke Lp 0psi  Hp 180psi, Noti to HM follow up CCU c/o. #3531 Ac2-1 CCU motor no compression to c/o Noti:2542047 #1531 Ac2-1 CCU choke to c/o Noti:2542048 Done by:Jack/Sanip/Koh/Rizman Date:13/1/2023