As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR CONDITION AND MASTER CAUTION LIGHTS ILLUMINATED ON RECALL AFTER ENGINE START, WITH CONTROLLER CABIN ZONE TEMP LIGHT. BOTH LIGHTS WENT OUT WHEN MASTER CAUTION WAS RESET. ACFT GROUNDED. NR 2 PACK/ZONE TEMP CONTROLLER LOGGED FLT DECK TRIM VALVE FAULT. PERFORMED CABIN TEMP CONTROLLER BITE, FAULT CLEARED. RAN LT AND RT PACKS, NO FAULTS. REF AMM 21-61-00-810-801.