What was found
CONTROL CABIN TEMPERATURE SELECTOR BARELY CONTROLS DUCT TEMP FULL COLD POSITION FOR 15 MINUTES COOLED DUCT TEMP BY ONLY 2 DEGREES. ACFT GROUNDED. REMOVED AND REPLACED THE CONTROL CABIN TRIM AIR MODULATION VALVE IAW AMM 21-61-21-000-801 AND 21-61-21-400-801 3A-G(3) DURING PACK/ZONE TEMP NR 2 CONTROLLER TEST CAB TRIM AIR MODULATING VALVE DOES NOT MOVE. PACK/ZONE TEMP TEST FAIL. R/R FWD CAB ZONE TRIM AIR VALVE REF AMM 21-61-21. VALVE STILL DOES NOT MOVE. R/R AIR CONDITIONING MODULE REF AMM 21-51-65. SYMPTOMS VARY. R/R TEMPERATURE CONTROL MODULE REF AMM 21-61-15. VALVE OPERATES NORMALLY. COMPLETED OPS TEST FOR PACK/ZONE TEMP, CONTROL CAB TRIM AIR VALVE, AIR CONDITIONING MODULE, TEMP CONTROL MODULE, AND FWD CAB ZONE. ALL OPS NORMAL.