As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT "WING O-FULL L" CAS MESSAGE ILLUMINATED, LOST 300 LBS IN 5 MINUTES. DURING POST FLIGHT INSPECTION, THE FUEL WAS STILL LEAKING OUT ON THE GROUND. INVESTIGATED AND FOUND LT FUEL VENT SYSTEM FLOAT TO BE STUCK IN VENT POSITION FREED FLOAT TO ALLOW IT TO OPERATE NORMALLY. OPS CHECK OK AT THIS TIME. ALL WORK DONE IAW CESSNA 750 MM 28-10-04.