As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU GENERATOR TRIPPED OFF LINE, AFTER RECONNECT, SMELLED AN ELECTRICAL BURNING ODOR THRUOUT ACFT. FOUND EVIDENCE OF ARCING AT APU STARTER GENERATOR TERMINAL BLOCK FILTER. REMOVERD AND REPLACED THE STARTER GENERATOR, IAW AMM 49-41-21-400-801.