As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXIING OUT FOR AN AIR AMBULANCE FLIGHT, THE MED TEAM THOUGHT THEY OBSERVED SMOKE FROM THE LEFT MLG AREA. THE FLIGHT CREW RETURNED TO THE BLOCKS AND HAD MAINTENANCE INSPECT THE LEFT MAIN LANDING GEAR, WHEELS AND BRAKES. NO DEFECTS WERE FOUND. THE CREW AND MAINTENANCE TAXIED THE AIRCRAFT AND BRAKES FUNCTIONED NORMALLY WITH NO SMOKE NOTED. THE FLIGHT WAS TAKEN BY OTHER AIRCRAFT.