As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL ZONE TEMP ILLUMINATES FOR CONT CAB EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED PACK ZONE TEMPERATURE CONTROLLER (PZTC) BITE PER B737-800 AMM 21-61-00-700-806-002 RH CONTROLLER FAULTED CONTROL CABIN TRIM VALVE. REMOVED ZONE TRIM VALVE V143 PER AMM 21-1-21-000-801. INSTALLED TRIM VALVE PER AMM 21-61-21-400-801 ACCOMPLISHED TRIM VALVE TEST PER AMM SUB TASK 21-61-21-400-801 PARA G.ALL TESTS PASSED.