As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR ENCOUNTERED DURING DESCENT FOR ABOUT 30 SECONDS, BEGAN TO FADE AFTER RECIRCULATION BUTTON WAS RELEASED. INSPECTED COCKPIT RECIRCULATION FAN AND FOUND THE FAN TO HAVE AN ELECTRICAL ODOR. R & R THE COCKPIT RECIRCULATION FAN, OPS CHECKED GOOD IAW AMM 21-24-01.