As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DECENT, A BURNING ODOR WAS PRESENT ON THE UPPER FLIGHTDECK, ODOR FOLLOWED BY HEAVY VIBRATION FROM RT SIDE OF AIRCRAFT. CREW ELECTED TO SHUTDOWN NR 3 PACK. VIBRATION STOPPED. MAINTENANCE FOUND NR 3 ACM AS CAUSE. DEFERRED NR 3 PACK IAW MEL 21-51-01-01.