As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED AN ELECTRICAL SMELL COMING FROM BEHIND LAVATORY 217 MIRROR. MAINTENANCE INSPECTED COMPARTMENT BEHIND LAVATORY MIRROR. MAINTENANCE FOUND THE LIGHT BALLAST TO BE HOT. MAINTENANCE DISCONNECTED THE BALLAST AND SMELL DISAPPEARED. NO FURTHER DEFECTS WERE NOTED. MAINTENANCE REPLACED THE BALLAST. OPERATIONAL CHECK WAS NORMAL.