As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED SPARKING/ARCHING INTERNALLY WITHIN TAXI LIGHT SWITCH ASSY WHILE ACTIVATING TAXI LAMP CIRCUIT. INSPECTION GUIDE INDICATES LIFE LIMITED PART REPLACEMENT OF SWITCH ASSY EVERY 5 YEARS. PREMATURE FAILURE OCCURED AT SWITCH LIFE OF 24 MONTHS (3-6-2009 UNTIL 3-21-2011, 764.6 HRS SINCE NEW).