As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING, STARTED APU WITH NO VOLTS OR FREQUENCY INDICATIONS. AFTER BLOCK IN, GROUND POWER DROPPED OFFLINE AND SHOWED VOLTS/FREQUENCY AND ACCEPTED POWER ON NR 1 TRANSFER BUSS. ACFT GROUNDED. R & R STARTER GENERATOR IAW AMM 49-41-21-000-801 AND 49-41-21-400-801.