As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OBSERVED ELECTRICAL SPARKS AT THE BASE OF SIDE WINDOW WHEN "PLT SIDE WDO HT" SWITCH WAS ON. SPARKING STOPS WHEN "PLT SIDE WDO/HT" SWITCH IS OFF. PERFORMED PILOT SIDE WINDOW HEAT OPS TEST AMM 30-41-00-710-802. CONFIRMED BASE OF WINDOW HEATING ELEMENT ARCING. REMOVED AND INSTALLED SERVICEABLE PILOT SIDE WINDOW IAW AMM 56-10-06-000-801 AND 56-10-06-400-801. OPS TEST GOOD. NO DEFECTS NOTED. RETURNED TO SERVICE.