As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5817 - BUF - FLIGHT CREW REPORTED BURNING ODOR FOR ABOUT 1 MIN IN THE COCKPIT AND FA REPORTED SMOKE IN COCKPIT IN THE BACK HALF OF CABIN. EWR MX REMOVED AND REPLACED NR 2 RECIRCULATION FAN AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.