MOC(RS) informed car 1552 was warm. UPDspare train was used to replace it at JKN2. ~~~~~ Both M1 Car Coolant pressure fault, 1552 @ 27.7'C.  1551 A/c 2-1, 1552 A/c 2-1 & 1-1 found coolant pressure fault. Charged freon & fault cleared. No sign of leak, cut in/out operation - OK. Able to achieve 24'C. Monitor for 2 hrs & no fault reoccurred.  Sarma/Kiran. 07/03/2020.