As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA-BWI FLIGHT#3920. CREW REPORTED THAT WHILE ON DECENT THEY NOTICED LOW OIL PRESSURE ON #1 ENGINE, OIL PRESSURE LIGHT ILLUMINATED. OIL PRESSURE DID NOT GO TO ZERO. WHEN LIGHT ILLUMINATED ENGINE WAS SECURED. MAINTENANCE REPLACED PROPELLER SHAFT SEAL AND ADDED SPACERS TO THE SEAL RETAINER. AIRCRAFT RETURNED TO SERVICE.