As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ON, AFTER AFTER START FLOW LIGHT GOES OUT AFTER MASTER CAUTION. ACFT GROUNDED. TROUBLE SHOOTING COMMENTS CALL OUT THE LT TEMP CONTROL VALVE AND THE AFT ZONE TRIM MODULATING VALVE. THE BITE ON NR 1 TEMP CONTROLLER CALLS OUT THE LH TEMP CONTROL VALVE. AS PRECAUTION, REMOVED AND REPLACED BOTH THE LT TCV AND THE AFT ZONE TRIM MODULATING VALVE IAW AMM 21-61-21-000-801 AND 21-61-21-400-801. LEAK CHECKED GOOD. GROUND FUNCTIONAL CHECKED GOOD IAW AMM 21-61-21-400-801 PARAGRAPH F.