As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUBMITTER STATED HAVE HAD 5 FAILURES OF THIS VALVE OVER 24 MONTH PERIOD. DIAPHRAGM FAILS AND FUEL LEAKS OVERBOARD. TIME RANGES FROM 101 HOURS TO 600 HOURS. PIPER P/N 461-731. ELECTRO SYSTEMS, P/N A 23 D0407.5, NEW VALVES OR OVERHAULED VALVES, MAKES NO DIFFERENCE.