As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE-FLIGHT INSPECTION THE FLIGHT CREW REPORTED A BURNING ODOR IN THE PASSENGER COMPARTMENT. MAINTENANCE INSPECTED AND FOUND THE SMELL COMING FROM THE BALLAST FOR THE OVERHEAD LIGHT AT SEAT 9A. THE BALLAST WAS DISCONNECTED AND THE LIGHT WAS DEFFERED PER MEL 33-20-00-2.