As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK LIGHT ILLUMINATED ON MASTER CAUTION RECALL. EXTINGUISHES ON MASTER CAUTION RESET. ACFT GROUNDED. ZONE TEMP CONTROLLER BITE TEST FAULTED THE LT PACK TEMP CONTROL VALVE AND WOULD NOT RESET. R & R THE LT PACK TCV IAW AMM 21-51-21. ZONE TEMP CONTROLLER BITE TEST PASSED WITH NO FAULTS. ALSO, THE HEAT EXCHANGERS WERE CLEANED, REF T/C 78121000.