What was found
MCI - FLIGHT 11, THE CREW REPORTED THAT ON TAKEOFF FROM MCI, ATC AND ANOTHER AIRCRAFT REPORTED VISUALLY SIGNIFICANT FUEL LEAKING FROM THE RIGHT WING. THE AIRCRAFT RETURNED TO MCI WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT HAND VENT VALVE, AND RIGHT HAND FLOAT VENT VALVE, LEAK & OPERATIONAL CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.