As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A BURNING ODOR IN THE REAR OF ACFT. MAINTENANCE INSPECTED THE ACFT AND FOUND THE LIGHT BALLAST BEHIND THE LAV MIRROR TO BE OVERHEATED. R & R THE LIGHT BALLAST, OPS TESTED WITH NO DEFECTS. ACFT APPROVED FOR RETURN TO SERVICE.