As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA INFLIGHT - NR 1 GENERATOR DRIVE LIGHT ILLUMINATED FOLLOWED BY LARGE JOLT IN THE FLIGHT CONTROLS. THE LT GENERATOR CONTROL LIGHT ILLUMINATED AND THE LEFT BUS WAS THEN POWERED BY THE RIGHT SIDE. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. REPLACED NUMBER ONE ENGINE INTEGRATED DRIVE GENERATOR. SYSTEM GROUND CHECKED NORMAL OPERATION.