TC reported air-con fault. Unable to reset. Staff (CBR) checked and confirmed that front M2 car #2 s et air-con faulty. Reset - ok. Car was cooling. ~~~~~ TC reported air-con fault. Unable to res     Check and found #2532-2-2 a/c found LP coupling heay freon leak.Further check found copper ring dented,replace copper ring and function test ok.#2532-a/c 2-1 found LP=5psi,HP=20psi low freon.Further check found CCU condenser side capillary tube was oily.Suspect freon leak from capillary tube. Not: raise to RSW to follow up CCU c/o Not: 2239803 raise to RSW. Checked by Sanip/Koh. 17/01/21