TC reported air-con fault. Unable to reset. Staff(CCK) checked and confirmed that car 2617 set #2 ai r-con faulty. Reset - ok. Car was cooling. TC reported air-c on fault. Unable to reset. Staff(CCK) checked and confirmed ~~~~~ TC reported air-con fault. Unable to reset. Staff(CCK) checked and confirmed that car 2617 set #2 air-con faulty. Reset - ok. Car was cooling. CE: 2617 #2 AC shortcycling. AC Warm.Temp 27.6*C  2617 Aircon 1-2 found low freon no sign off leak. Top freon and function check ok. 1617 A/C 1-2 found low freon and minor leak of low pressure pipe coupling, Tighten back and top freon and function test ok. No sign of leak. 2618 1-1 found low freon, Top up freon and function check ok. No sign of leak.    Done by henry/haikel/Kumar 45146