As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WING TANK O FULL L MESSAGE ILLUMINATED DURING CRUISE. CYCLED ON & OFF REPEATEDLY. THIS WAS FOLLOWED BY FUEL VENTING. MESSAGE EXTINGUISHED & VENTING STOPPED AFTER 15 MINUTES. INSPECTED OUTER WING BOX VENT & FLOAT SWITCH. INSPECTED CLIMB VENT TUBE GAP & FOUND IT IS .041 INCHES. ALL CHECKED GOOD WITH NO FAULTS AT THIS TIME IAW MM 28-10-04.