As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - AIR COND - CABIN TEMPS VERY HARD TO CONTROL, MOST AFT ZONE. VERY COLD SHOWING 70 DEGREES WHILE VALVE SHOWED FULL HOT. F/A'S ALSO TRIED TO MODIFY TEMPS, ALL ZONES SOMETIMES HOT THE VERY COLD. // PERFORMED TSM 21-63-00-810-827-A. REMOVED AND REPLACED TRIM AIR VALVE (636HK) REF AMM. 21-63-51. LEAK AND OPS CHECK GOOD OK FOR SVC. VALVE, TRIM AIR OFF 33-2160-9-0005 32992 ON 33-2160-9-0005 39488