As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, AT 35000 FEET, LEFT PACK LIGHT ILLUMINATED. PERFORMED THE QRH THAT LED US TO TURN LEFT PACK SWITCH TO OFF. ACFT GROUNDED. OBSERVED THE LT PACK LIGHT ILLUMINATED WITH RECALL EXTINGUISHED WITH MASTER CAUTION RESET. CLEARED NR 1 PACK ZONE TEMP CONTROL VALVE FAULT. ACCOMPLISHED BITE OF BOTH PACK, ZONE TEMP CONTROLLERS IAW AMM 21-61-00. NO FAULTS NOTED. GROUND VERIFICATION SUCCESSFUL.