As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE OIL PRESSURE WAS AEE AT IE THEN STARTED DROPPING FOLLOWED BY MASTER WARNING OIL TEMP REMAINED NORMAL. LT ENGINE RUNNING PRESSURE STABALIZED AT 15 PSI. ON APPROACH NR 2 PROP STARTED TO ROLL BACK ON THREE OCCASIONS. OIL PRESSURE DROPPED TO ABOUT 3 PSI ON LOG, SHUT ENGINE DOWN ON TAXI IN. MASTER WARNING ON APPROX 20 MIN. LANDING UNEVENTFUL. REPLACED NR 2 ENGINE. RETURNED TO SERVICE.