As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON MASTER CAUTION RECALL ZONE TEMP FOR CONT CAB ILLUMINATES, RESETS ON MASTER CAUTION RESET. GROUNDED - YES. HAD NO FAULTS AND BITE PASSED BUT SYSTEM HAS HISTORY. AS PRECAUTIONARY REMOVED AND REPLACED CONTROL CABIN TRIM MODULATING VALVE IAW B737-900 AMM 21-61-21-000-801 AND AMM 21-61-21-400-801. ETOPS GROUND FUNCTIONAL CHECK GOOD IAW AMM 21-61-00-700-806-002.