As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN- LEFT AIR CONDITIONING PACK AUTO FAILED WITH SMOKE IN THE CABIN. LEFT PACK WENT TO 99 DEGREES ON SYNOPTIC PAGE. NO EXHAUST FROM LEFT AIR CONDITIONING PACK. MAINTENANCE PLACED LEFT AIR CONDITIONING PACK ON MEL 21-51-1A. AIRCRAFT RETURNED TO SERVICE. SUP- MEL CLEARED BY REPLACING AIR CYCLE MACHINE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.