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 INSPECTION OF THE ACFT. THE SWITCH WAS REPLACED AND THE ASSOCIATED WIRING CHECKED FOR CONDITION. GROUND TEST CHECKED SERVICEABLE. THIS TYPE OF SWITCH IS SUBJECT TO A SB REQUIRING REPLACEMENT EVERY 5 YEARS. THIS SWITCH WAS DOCUMENTED AS BEING DUE FOR REPLACEMENT AUG. 24, 2011.