As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK/ENGINE START CONT CAB ZONE TEMP LIGHT ILLUMINATED ON RECALL, EXTINGUISHED UPON MASTER CAUTION RESET. GROUNDED-YES. VERIFIED DISCREPANCY, PERFORMED BOTH TPC BITE B737-900 FIM 21-62 TASK 801. FOUND ON NR 2 PZTC FLT DECK TRIM VALVE FAULT. ABLE TO CLEAR FAULT. PERFORMED FIM TASK 21-62-00-810-842. GROUND RAN BOTH PACKS FOR 1 HR. NO FAULTS RETURNED.