What was found
LEFT ZONE TEMP AND BLEED LIGHTS ILLUMINATE WITH APU OFF. ACFT GROUNDED. R & R AIR CONDITIONING MODULE IAW MM 21-51-65-000-801 & MM 21-51-65-400-801. PACK/ZONE TEMP CONTROL BITE IAW MM 21-51-00-700-803 SHOWED NO FAULTS, BUT WITH NEW P5-10 MODULE INSTALLED THE CONTROL CABIN ZONE TEMP FAULT LIGHT WAS ON. REF SSM 21-61-11-101. FOUND V143 CONTROL CABIN TRIM MODULATING VALVE INTERMITTENTLY STICKING IN FULL OPEN POSITION. REMOVED, REPLACED, AND TESTED V143 ZONE TRIM VALVE IAW MM 21-61-21-000-801, MM 21-61-21-400-801. OPS NORMAL, NO LEAKS NOTED. PERFORMED AIR CONDITIONING MODULE INSTALLATION TEST IAW MM 21-51-65-400-801, RECIRCULATION SYS OPS TEST IAW MM 21-25-00-710-802-002, AND PACK/ZONE TEMP CONTROLLER BITE IAW MM 21-51-00-700-803. ALL TESTS PASS.