As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK ILLUMINATED, LIGHT GOES OUT WITH MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED PACK ZONE TEMP CONTROLLER BITE REF B737-900 AMM 21-61-20-400-801. HARD FAULT SHOWS FOR LEFT PACK TCV. REMOVED & REPLACED TCV REF AMM 21-51-10-400-801. LEAK CK GOOD PER THE SAME. REACCOMPLISHED PACK ZONE TEMP CONTROLLER BITE REF AMM 21-61-20-400-801. FAULT CLEARED. GROUND VERIFICATION SUCCESSFUL.