As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE CREW REPORTED AN ELECTRICAL BURNING SMELL. MAINTENANCE INSPECTED THE AIRCRAFT AND DETERMINED THAT THE SMELL WAS COMING FROM AN OVERHEATED LIGHT BALLAST. THE BALLAST WAS DE-ACTIVATED AND THE LIGHT WAS DEFERRED PER THE MEL.