As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED DURING APU START. ATTEMPTED TWO STARTS WITH SAME RESULTS, ALL CIRCUIT BREAKERS IN. ACFT GROUNDED. REMOVED & REPLACED APU STARTER-GENERATOR, IAW AMM 49-41-21. OPS & LEAK CHECK GOOD IN ADDITION TO MAGNETIC DRAIN PLUG. APU GEN VOLTS/FREQUENCIES FAULT LIGHT GOOD.