As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH NR 2 ENGINE AND APU RUNNING, EXPERENCED BUSS FAULT WHEN ATTEMPTING TO START NR 1 ENGINE. RETURN TO GATE. SMOKE WAS SEEN COMING FROM NR 1 COWLING. SHUTDOWN ACFT AND EVACUATED. R & R NR 1 START CONTACTOR 2431K1 AND NR 1 START GENERATOR IAW PWC 24-30-02R. OPS CHECKED GOOD.