As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CLIMB, THE RT CSD WENT ABOVE RED LINE AFTER 20 MINUTES OF FLIGHT. CREW DISCONNECTED THE CSD. THE APU WAS STARTED BUT IN CRUISE AT FL350 THE APU SHUT ITSELF DOWN. RESTARTED APU AT FL280. FLIGHT RETURNED TO LAS. THE APU OIL WAS SERVICED. CORRECTIONS TO RT CSD WERE DEFERRED PER MEL. ON LAYOVER THE CSD WAS REPLACED. CHECK-C 2-22-00 STL.