As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLT 3204 - CREW REPORTED THAT DURING TAXI OUT THEY OBSERVED SMOKE IN THE COCKPIT AND CABIN, AIRCRAFT RETURNED TO THE GATE WITHOUT FURTER INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT THEN REMOVED AND REPLACED THE RIGHT GROUND COOLING FAN IAW EMB-120 MM 21-51-03. OPERATIONAL CHECKS WERE SATISFACTORY, AIRCRAFT RELEASED FOR SERVICE. (M)