As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED ON TAKEOFF, QRH ACCOMPLISHED LIGHT EXTINGUISHED WITH TRIP RESET, INFO ONLY. GROUNDED - YES. ACCOMPLISHED PTC BITE OF BOTH TEMP CONTROL'S 1 & 2 FIM 21-62 TASK 801 NO FAULTS LOGGED. RAN BOTH PACKS FOR 20 MIN AND LEFT PACK LT ILLUMINATED AND PACK SHUTDOWN. RAN PTC BITE AND NR 1 CONT TCV FAULTED AND WOULD NOT RESET. REMOVED & REPLACED LT TEMP CTRL VALVE REF AMM 21-51-10. LEAK & OPS CHECKED GOOD. RAN BOTH PACKS FOR 20 MINS NO FAULTS. GROUND VERIFICATION SUCCESSFUL.