As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AFTER START CHECK, ON MASTER CAUTION RECALL, THE CONTROLLER CABIN ZONE TEMP LIGHT ILLUMINATED. THE ZONE TEMP LIGHT EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. FOLLOWED QRH NO FURTHER ACTION REQUIRED. ACFT GROUNDED. PERFORMED PACK/ZONE BITE TEST IAW AMM 21-51-00-700-803. NO FAULTS INDICATED. BITE TEST PASSED.