As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6151 - SBA-PHX - AFTER BEGINNING THEIR INITIAL DESCENT THE OIL PRESSURE ON THE RIGHT ENGINE DROPPED TO 23 PSI. AFTER SECURING THE NR 2 ENGINE, THE PLANE LANDED UNEVENTFULLY. MAINTENANCE FOUND A OIL SHAFT SEAL WHICH WAS INSTALLED TO COMPLY WITH A PREVIOUS MEL HAD BECOME DISLOGGED. MAINTENANCE REPLACED THE HYD PUMP SIGNING OFF THE MEL. (M)