Snap rep. reported 3557 Aircon down 25.9 ~~~~~ Snap rep. reported 3557 Aircon down 25.9     #3557 a/c 2-2 having low freon.Retop to LP-40 & HP-100 checked CCU for sign of leaking.No leaks observed during monitoring and a/c able to cut in/out. #3557 A/C 1-1 found no heat exchange.Found CCU no compression,isolated U-V-W to raise notification to RSW for CCU c/o. Not: 2122363 raise to RSW. Done by Jack/Koh/Saini. 19/01/20