2704 A/C 1-1 found coolant fault during ~~~~~ Check and found A/C 1-1 LP coupling loose and cause low freon.Tighten charge freon monitor observed LP drop,further check evaporator found icing badly,suspect evaporator condenser unit internal    freon leaking.Replaced evaporator unit function test ok. #2704 evaporator unit: Old s/n: 634022 New s/n: 331091 Not: 2284509 raise to RSW. Done by Sanip/Koh/Sateesh.  10/06/21