What was found
FWD CAB TEMPERATURE CONTROLLER IS ERRATIC. UNABLE TO MAINTAIN THE IDEAL 21C -22C SUPPLY DUCT TEMP. AT APPROX 9 O`CLOCK POSITION THE SUPPLY DUCT TEMP IS 10 C IF THE TEMPERATURE CONTROLLER IS CLOCKWISE THERE IS NO CHANGE IN THE DUCT TEMPERATURE UNTIL ABOUT THE 10 O`CLOCK POSITION AT WHICH TIME THE DUCT TEMP WILL CREEP UP TO APPROX 70 C (VERY SLOW). ACFT GROUNDED. ACCOMPLISHED BIT TEST NO DEFECTS NOTED IAW FIM TASK 864, STEP A - F(1)(B) NO HISTORY PAST 30 DAYS.