As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4323 - ON CLIMB-OUT, THE LEFT ENGINE OIL PRESSURE STARTED TO FLUCTUATE BETWEEN 75 AND 125 PSI. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLAFED THE LEFT OIL PRESSURE TRANSDUCER. SYSTEM TESTED GOOD. (M)