As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMP-ILLUMINATES WITH SYSTEM CHECK-RESET OUT WITH PUSH MASTER CAUTION QRH-FOLLOWED. GROUNDED - YES. PERFORMED PZTC #2 TEST FOUND FLT DECK TRIM VALVE FAULT, RESET FAULT AND RAN BOTH PACKS TO FULL COOL & FULL WARM, NO FAULTS PRESENT WITH RECALL TEST, REF B737-900 AMM 21-61-20 & AMM 21-00-00.