As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINES STARTED WITH PACKS ON RESPECTIVE ENGINES CABIN CONTROL ZONE LIGHT ILLUMINATED. CHECKLIST WOULD NOT SOLVE PROBLEM. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE REF AMM 21-61-21, FAULT LIGHT FOR PRIMARY FLT DECK TRIM AIR VALVE ILLUMINATED, REMOVED AND REPLACED PRIMARY FLT DECK TRIM AIR VALVE REF AMM 21-61-21, OPS AND LEACK CHECK GOOD.