As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATES WITH MASTER CAUTION RECALL. EXTINGUISHES WITH PRESS OF MASTER CAUTION LIGHT. ACFT GROUNDED. R & R LT PACK TEMPERATURE CONTROL VALVE (TCV), REF AMM 21-51-10, OPS AND LEAK CHECK GOOD. BITE TEST ON LT CONTROLLER, NO DEFECTS NOTED, AMM 24-22-00-860-811.