As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SBN - FLT 4023 - NR 1 ENGINE LOW OIL PRESSURE WARNING ILLUMINATED WITH OIL PRESSURE FLUCTUATING AT 40-45. CAPTAIN DIVERTED TO SBN AFTER SHUTTING DOWN ENGINE DURING FLIGHT. FOUND OIL LEVEL LOW. REMOVED AND INSPECTED O-RING ON OIL VENT TRANSFER TUBE AND TIGHTENED B-NUT ON SCAVENGE TUBE. PERFORMED LOW OIL PRESSURE CHECK IAW P/W MM. CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)