As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ENGINE OIL PRESSURE FLUCTUATING IN CRUISE FLIGHT. ENGINE OIL RESERVOIR CONTAINED ONLY ONE INCH OF OIL WHEN CHECKED. OIL LEVEL IN RESERVOIR HAD BEEN AT NORMAL OPERATING LEVEL ON PREFLIGHT. MAINTENANCE FOUND THE NR 1 BEARING SEAL LEAKING. REPLACED THE ENGINE ASSEMBLY.