As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXIING IN EWN, NR 2 SIDE DC BUSS FAULTED AND THERE WAS SOME SMOKE ON NR 2 SIDE. THE SMOKE WAS FOUND TO BE COMING FROM THE APU. FOUND THE STARTER GENERATOR OVERHEATED AND APU START CONTACTOR WELDED. NO DAMAGE FOUND IN THE APU AREA. REPLACED THE START CONTACTOR K-62 AND INSPECTED WIRING, NO DEFECTS NOTED.