As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DC GENERATOR SOLD AS OVERHAULED EXCHANGE UNIT. FAILED IN-FLIGHT. BEARINGS DID NOT FAIL. SUSPECT THE ROTOR ASSY RETAINING BAND/BANDS SEPARATED CAUSING SEVERE DAMAGE TO THE GENERATOR SUB-ASSEMBLIES. FUTURE OVERHAULS/REPAIRS WILL REQUIRE 10X MAG AND PROBE INSPECTION TO ENSURE INTEGRITY OF SPOT WELDS.