As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED WHEN POWER WAS REDUCED FOR DESCENT. SMOKE WAS SEEN COMING FROM AIR CONDITIONING SYSTEM. GRADUALLY REDUCED TO NOTHING OVER 15 MINUTES TIME. INSPECTED AIR CONDITIONING SYSTEM AND ACM’S. PERFORMED OPERATION CK PER 21-20-00. NO DEFECTS NOTED. OPS NORMAL.