As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE STRONG BURNING ODOR IN COCKPIT DUE TO PREVIOUS REPORTS ON RT PACK THE PACK WAS TURNED OFF AND THE ODOR DISSIPATED. THE ODOR WAS IN COCKPIT. IAW WDM AND AMM 33-22-07/525 AND 20-50-01 /201 IN LT UPPER SIDE WALL LIGHTING TRANSFORMER LINE IL 1701F18 WAS FOUND SPLICE BURNED. THE SPLICE WAS REPLACED AND CHECKED DURING SEVERAL TIMES.