As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5803 ON POWER UP AND ENGAGING WINDOW HEAT SAW TWO SPARKS FROM THE R FWD WINDOW CONNECTOR. CORRECTIVE ACTION: FOUND WINDOW HEAT PLUG D3274 LOOSE AND BURNT REPLACED WINDOW HEAT PLUG B7578 AMM 30-41. TEST WINDOW HEAT B757 AMM 30-41 CKS GOOD. (8189388)