As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON MASTER CAUTION RECALL GOT LT PACK LIGHT. RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED BITE TEST & PREVIOUS FLT ON LT PACK ZONE TEMP CONTROL. FAULTED THE TEMP CONTROL VALVE. PERFORMED VERIFICATION; PASSED IAW MM 21-61-00-700. NO DEFECTS NOTED, NO HISTORY 60 DAYS.