EMU 507/508 During DT found #2508 A/C 1- ~~~~~ 2508 During DT found A/C 1-1 Coolant pressure fault.  2508 A/c 1-1 found LP=10 psi HP=70 psi. Vacuum system (1.5 hrs) & charged in freon 7kg. LP=35 psi HP=110 psi. Used soap solution to conduct freon leak check & no leak found on CCU - OK. Temp. able to achieve 24'C-25'C. Cut in/out operation check - OK. Monitor for 2 hrs & found no drop in pressure - OK.  Kiran 44125