As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REPLACING FAILED FLUORESCENT BULB FOR CABIN LIGHTING, FOUND PLASTIC BULB ENDS (CONNECTORS) BURNED AND MELTED. FOUND ALL OTHER BULBS IN SIMILAR CONDITION AND REPLACED ALL. RECOMMEND INSPECTING ALL PRECISION WINDING BULBS, NEW BULBS HAVE CERAMIC ENDS (CONNECTORS).