As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LANDING LIGHT SWITCH WAS REPORTED TO BE STUCK IN THE "ON" POSITION DURING A PRE-FLIGHT INSP. THE SWITCH WAS REPLACED AND THE ASSOCIATED WIRING INSPECTED FOR CONDITION. THE REPLACEMENT SWITCH GROUND CHECKED SERVICEABLE. THIS TYPE OF SWITCH IS SUBJECT TO A RECURRING SB REQUIRING SWITCH REPLACEMENT EVERY 5 YEARS. THE FAULTY SWITCH HAD BEEN INSTALLED AUGUST 29, 2009.