As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3357 - CLE - CRUISE FLIGHT LEFT ENGINE OIL PRESSURE ROSE TO 68/69 PSID, AS PER QRH REDUCED POWER TO 40 PERCENT, OIL PRESSURE REMAINED AT 66/68 PSID FOR REMAINDER OF FLIGHT. MAINTENANCE REMOVED TWO WASHERS FROM OIL PRESSURE REGULATOR IAW PWA 72-01-50 AND 72-00-00. RAN ENGINE OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (M)