As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CABIN ZONE TEMP LIGHT ILLUMINATED AND STAYS ON. CABIN TEMP REMAINED UNDER CONTROL. TRIP RESET DID NOT EXTINGUISHED THE LIGHT. GROUNDED - YES. VERIFIED DESCREP. PERFORMED FIM 21-62 TASK 840, ALL T/S STEPS WITH NO HELP. BOTH PACK/ZONE TEMP CNTLRS BITE WITH NO FAULTS & NO CURRENT FAULTS WITH VERIFY TEST. REMOVED & REPLACED P5-10 AIR CONDITIONING MODULE REF AMM 21-51-65, ALL INSTALLATION TEST PASSED. GROUND VERIFICATION CONFIRMS FIX.