As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APU CHANGE, STARTER GEN WAS TRANSFERRED FROM OLD APU & INSTALLED. DURING START UP, APU SHUTS DOWN WHEN GEN COMES ON LINE. FOUND APU STARTER GEN COOLING FAN TIPS RUBBING INSIDE DUCT COVER. REPLACED STARTER GEN WITH OVERHAULED UNIT. OPERATIONS CHECKED GOOD, NO LEAK OR FAULTS NOTED.