As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN ZONE TEMP LIGHT ILLUMINATED ON MASTER CAUTION RECALL. ACFT GROUNDED. NR 1 TEMP CONTROLLER BITE PROCEDURE, 21-62 TASK 801 SHOWED ON BIT & PREVIOUS FLT SHOW ZONE TRIM VALVE FAULT. REPLACED: ZONE TRIM AIR MOD VALVE FOR THE AFT CABIN POSITION. REF: AMM 21-61-21. ZONE TEMP CONTROLLER INTERROGATION CLEAN. REF: AMM 21-51-00.