As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL INFLIGHT TPA-ORD. CREW REPORTED LEFT ENGINE CONSTANT SPEED DRIVE FAILED AND UNABLE TO START AUXILIARY POWER UNIT. FLIGHT DIVERTED ATL LANDED WITHOUT INCIDENT. FOUND LEFT ENGINE CSD OVERSERVICED. SERVICED LEFT ENGINE CSD TO PROPER SERVICING LEVEL. SYSTEM GROUND CHECK NORMAL OPERATION.