As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 2278 - LGA - AT FL 150 LOST RIGHT CSD. THE FLIGHT RETURNED TO FIELD AT LGA. THE APU WAS ON MEL. NR 2 CSD DISCONNECTED FOR HIGH OIL PRESSURE. MAINTENANCE FOUND NR 2 CSD OVER SERVICED WITH OIL. DRAINED OIL LEVEL TO NORMAL. REMOVED AND REPLACED CSD FILTER AS PRECAUTION. CHECKED IAW MM OPS CHECK OK. (M)