As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING REMOVAL OF M/R, NR 2 ACFT GEN WAS REMOVED AND DISCOVERED THAT THE NUT THAT HOLDS THE SPLINED DRIVE SHAFT HAD COME OFF AND FELL INTO THE COMPONENT IMPELLER CAUSING SUBSTANTIAL DAMAGE TO THE IMPELLER ITSELF, THE INTAKE COVER AND TO THE INTERNALS OF THE AC GEN.