As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L TRIM AIR OFF LIGHT ILLUMINATED WITH FWD AND AFT CABIN TEMP CONTROLLER INOP LIGHTS ILLUM. ATTEMPTED TO AND RESET C/B`S, NO HELP. FWD TO MCO AND PLACARD PER MEL 21-61-03. TRIM AIR VALVE LOCKED CLOSED. C/P REMOVED AND STOWED. NO TROUBLE FOUND. OPERATED PACKS NO ABNORMALITIES AFTER REACTIVATING VALVE. TRIM AIR VALVE HAS NORMAL OPERATION. DUE TO HISTORY REMOVED AND REPLACED LT CTC. GROUND TEST GOOD. PACK VAL OPS NML. MCO AND PLACARD REMOVED.