As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1315 - WDG - LEFT ACM STARTED TO BLOW SMOKE AND WOULDN'T ADJUST TO COOLER SETTING. ACM BEARING FAILURE. REPLACED LT ACM AND MIXING VALVE. MIXING VALVE HAD FAILED IN THE HOT POSITION. TEARDOWN OF THE ACM REVEALED IT HAD BEEN OVERSERVICED. A MEMO OF SERVICING OF ACM'S HAS BEEN ISSUED. (M)