As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PARKED AT THE GATE & STARTING NR 1 ENGINE THEY HAD A GENERATOR BUSS FAULT. SHUT ENGINE DOWN, NOTICED SPARK & SMOKE COMING FROM THE ENGINE. THEY BLEW BOTH FIRE BOTTLES. REPLACED THE NR 1 STARTER GEN & OPERATION CHECKED SATISFACTORY.