As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: JUST PRIOR TO DESCENT FROM FL400, FLIGHT ATTENDANT REPORTED ELECTRICAL BURNING ODOR NEAR SEAT 4BC; ODOR DISSIPATED WITH GASPER FAN TURNED OFF. REPLACED FWD UPPER RECIRCULATION FAN WITH SERVICEABLE UNIT IAW AMM 21-25-01-000-801 AND AMM 21-25-01-400-801, OPS CHECK GOOD.