As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL, CONT CABIN ZONE TEMP CAUTION LIGHT ILLUMINATES. LIGHT EXTINGUISHES WHEN MASTER CAUTION IS PUSHED. GROUNDED-YES. PERFORMED BITE CHECK ON PZTC 2 FOUND FLIGHT DECK TRIM VALVE CLEARED ON RESET. ACCOMPLISHED B737-900 FIM 21-62 TASK 842 RAN PACK FOR 30 MINUTES NO FAULTS.