As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CLIMBING THROUGH 8000 FEET, THE NR2 GENERATOR "HIGH OIL TEMPERATURE LIGHT" CAME ON. COMPLETED CHECK LIST AND SHUTDOWN CONSTANT SPEED DRIVE (CSD) AND STARTED APU. JUST LEVELING OFF AT 31,000 FEET WHEN APU "HIGH OIL TEMPERATURE" AND "LOW OIL PRESSURE" LIGHTS CAME ON AND THE APU SHUT DOWN. AIRCRAFT RETURNED TO BASE. NR2 ENGINE CSD WAS REPLACED.