655/656 when coupler up heavy air at emu ~~~~~ 2656 when coupler up heavy air at emu 26     #2656 No air leak from coupler side.Uncouple and functional check #2655/#2656 ok no air leak.Clean/paint coupler and recouple back ok.No air leak sound.#2656 only found MPV(Mean pressure v/v)air leak sound.Replace MPV-ok,no air leak occurance. #2656-MPV:- New s/n: 352042 Old s/n: 351830 Not: 2435654 raise to CSC. Done by Saini/Haslan. 14/11/22