TC reported air-con fault. Unable to reset. Staff(CCK) checked and confirmed that Rear M1 car set #1air-con faulty. Reset - ok. Car was cooling. ~~~~~ To replace #1532 A/C 1 evaporator (AHU) TC reported air-con fault. Unable to res To check any choke in the CCU and AHU.  1532 A/c 1-2 vacuum for 2 hrs to -30psi & charged in 6.8kg of freon. HP = 200 psi, LP = 0 psi. No icing found at evap. coil. OPS 30 raised to replace evaporator unit.  Sarma/Anand 44622