As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 PACK LIGHT ON RECALL. GROUNDED - YES. REF B737-900 FIM 21-62 TASK 801/830. PTC #1 BITE SHOWS 'THIS PACK TCV' FAULT. REQUIRES V139 LEFT TCV. REMOVED & REPLACED V139 LEFT TCV PER B737-900 AMM 21-15-10 PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST PER AMM 21-61-00 NO FAULTS NOTED.