As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WING TANK O-FILL-R CAS MESSAGE ILLUMINATED IN FLIGHT. FUEL VENTED OVERBOARD, THEN STOPPED. CAS MESSAGE WENT OUT BUT CAME ON AGAIN SHORTLY THEREAFTER, CAS MESSAGE THEN WENT OUT. REMOVED FLAPPER VALVE DUE TO MALFUNCTION. INSTALLED NEW FLAPPER VALVE IAW CE750 M/M CHAP 28-10-05. FUNCTIONAL/LEAK CHECK GOOD.