As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE PREFLIGHT PANEL SCAN, THE PILOT SEAT CIRCUIT BREAKER WAS OPEN. THE BREAKER WAS RESET. A SMALL AMOUNT OF ELECTRICAL SMOKE WAS NOTED AT THE BREAKER ITSELF WHEN THE MASTER POWER WAS TURNED ON. THE WIRE HARNESS FOR THE PILOT SEAT HEIGHT ADJUSTMENT ACTUATOR WAS FOUND TO BE CHAFED AND ARCING AGAINST THE SEAT BASE FRAME. THE WIRING HARNESS WAS REPAIRED AND SECURED.