As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE OVERHEAD LIGHT CABIN ROW 27 RT SIDE WAS ARCING AND HAD AN ODOR. CREW REMOVED THE BULB. MAINTENANCE REMOVED THE CONNECTOR FROM THE LIGHT BALLAST AND DEFERRED CORRECTIONS PER MEL. NO CHECK-C. *S/D* FOUND LAMPHOLDERS HAD BURNED CONTACTS CAUSED BY LAMP NOT PROPERLY SEATED IN LAMPHOLDERS. REPLACED THE LAMPHOLDERS.