As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - DURING CLIMB FLIGHT ATTENDANT NOTED ELECTRICAL SMELL FROM LAVATORY 3F-1R. EMERGENCY DECLARED RETURNED JFK LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND OVERHEAD LIGHT ASSEMBLY IN LAVATORY 3R WITH BURNT AND MELTED RECEPTICLE. REPLACED LIGHT ASSEMBLY. SYSTEM GROUND CHECK NORMAL OPERATION.