As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE, INDICATION OF LOSS OF ELECTRICAL POWER OF THE #2 DC STARTER/GENERATOR. CREW ELECTED TO MAKE AN UNSCHEDULED PRECAUTIONARY LANDING AT KATL. UPON INSPECTION, THE STARTER GENERATOR WAS DISCOVERED TO BE INTERNALLY FAILED, AND HAD SHEARED ITS DESIGNED DRIVE SHAFT SHEAR POINT. PRIOR TO IT SHEARING ITS SHAFT, THE STARTER GENERATOR SHEARED ITS QAD MOUNT DOWEL PINS AND ROTATED APPROXIMATELY 45 DEGREES ON ITS MOUNT PAD.