What was found
AIRCRAFT IS HOT. CANNOT BE COOLED ON GND OR AIR UNTIL REACHING CRUISE. BITE TEST CABIN TEMP CONTROL, CTC HAS NO POWER TO BIT TEST, REST SYS, NO HELP. R & R CABIN TEMP CONTROLLER PER AMM 21-61-01 OPS CHKD GOOD. PERFORMED TEST, BOTH PACKS & SELECTING CABIN TEMP, FOUND RT AIR MIX VALVE GOING TO FULL HOT IN AUTO MODE WHEN COLD SELECTED. PERFORMED FIM TASK 21-52 TASK 856, FOUND 35 DEGREE SENSOR, CONTROL VALVE & MODULE GOOD, BUT AIR MIX VALVE FAILED. REMOVED RT AIR MIX VALVE PER AMM 21-61-02-000-801. REPLACED TEMP CONTROL REF AMM. 21-61-02. DID NOT FIX. AUTO MODE STILL NOT COOLING RT PACK. MANUAL MODE CHKD GOOD. CABIN WAS ABLE TO BE COOLED IN MANUAL MODES. R & R CABIN TEMP CONTROLLER IAW AMM 21-61-01, OPS CHKD GOOD.