Cab air-con was blowing warm air. ~~~~~ Check #3518 cab a/c controller faulty. Swap controller from #3517, #3518 able to cut in/out. Temp 24.3C. Temp cut in=25.3, cut out=23.0. Freon level HP=240psi and LP=65psi. Checked by Alauddin/Sateesh. Not: 2237310 raised.     #3517 Cab a/c control unit replaced. Function test cut in/out cooling ok. Done by Koh. 9/01/21.