As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REPLACING A FAULTY MAGNETO, THE ENG DRIVEN FUEL PUMP WAS OBSERVED TO BE LEAKING FUEL FROM THE SEAL CAVITY, WHEN TURNING THE FUEL BOOST PUMP ON OR OFF, BUT NOT DURING RUNNING. THIS IS THE 3RD OCCURRENCE WE HAVE HAD OF SIMILAR LEAKAGE IN 3300 ENG HOURS. THE MFG MUST REMEDY THIS PROBLEM BECAUSE IN ADDITION TO THE HAZARD OF A LEAKY FUEL PUMP, THE REPLACEMENT OF AN ENG DRIVEN FUEL PUMP IS A VERY INVASIVE PROCEDURE WITH A LOT OF POTENTIAL FOR CAUSING OTHER PROBLEMS IF NOT CARRIED OUT PERFECTLY.