As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO DEPARTURE A BURNING SMELL, VERY STRONG IN THE COCKPIT WITH VISIBLE SMOKE FROM BEHIND THE INSTRUMENT PANEL. MAINTENANCE FOUND THE EQUIPMENT COOLING SUPPLY BLOWER WITH EXCESSIVE OIL DEPOSITS ON THE INSIDE. MX REPLACED THE BLOWER FAN.