As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 CSD (CONSTANT SPEED DRIVE) LOW OIL PRESSURE AND GENERATOR FAILEDC: CREW DISCONNECTED CSD; THE NR 1 CSD WAS ALREADY ON MEL SO THE AIRCRAFT RETURNED TO SNA ON APU POWER; THE CSD WAS REPLACED ALONG W/ CSD OIL COOLER; THE MEL ON THE NR 1 CSD WAS CLEARED AT THE SAME TIME