TC feedback cab air-con was not working.Unable to reset. Cab was warm. TC feedback cab air-con was not working. Unable to reset. Cab was warm. ~~~~~ 3552 TC feedback cab air-con was not working. Unable to reset. Cab was warm. CE : 3552 cab aircon very warm .  3552 cab A/c found pressure low (LP=20psi, HP=110psi). Checked for any leakage & suspect evaporator coupling leak. Vacuum system & top up freon to LP = 60 psi, HP = 250 psi. Function test & monitor for 1 hour - OK. After 1 hour, running pressure : LP = 55 psi, HP = 245 psi. Cab area temp. 22*C - 23*C. OPS 20 raised to check evaporator coupling for freon leak.  Anand/Sugu 45057 To check Cab Evaporator for leak Check and found cab a/c evap gas pipe auto coupler freon leak,HP=200psi ,LP=40psi Cooling ok. Clean up leak freon and re-coupling evap gas pipe and charge up freon HP=230psi,LP=55psi.Monitor no freon leak cooling ok. Done by Sanip/Koh/Rizman. 12/05/23