As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR IN CABIN AND COCKPIT DURING CRUISE AT FL370. TURNED RT RECIRCULATION FAN OFF, ODOR GONE. REPLACED RT AND LT RECIRCULATION FAN FILTERS IAW MM-21-25-02 AND ACCOMPLISHED CHECK, IAW MM-21-00-01 OPS CHECKED NORMAL. NO ELECTRICAL ODOR NOTED.