As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE BOARDING, ELEC SMELL WAS NOTICED. LIGHT BALLAST LOCATED ABOVE ROW 7AB WAS BURNING. CHARRING OCCURRED ON THE OVERHEAD CEILING PANEL & INSULATION BAGS AROUND THE BALLAST ALSO BURNED UP. ACFT REMOVED FROM SERVICE. REPLACED LAMP & BALLAST. OPERATIONS CHECKED NORMAL.