As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 1669 - AFTER TAKEOFF FROM PHL EN ROUTE TO LAS, NR 1 CSD LOW OIL PRESSURE LIGHT ILLUMINATED FOLLOWED BY NR 1 ENGINE GENERATOR DROPPING OFF LINE. CREW DISCONNECTED NR 1 CSD AND DIVERTED TO PIT WHERE LANDING WAS WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED LEFT ENGINE CSD. GROUND OPS CHECKS NORMAL.