As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4241 - ON CLIMB-OUT, THE LEFT PROP GEAR BOX OIL PRESSURE WENT TO MAXIMUM READING. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LEFT PGB OIL FILTER CONTAMINATED WITH METAL. REPLACED LEFT PGB. AIRCRAFT RETURNED TO SERVICE. (M)