Tl* the contact owns a 2010 kia sedona equipped with kuhmo 225/70/r16 (n/a) tires. the contact stated that the tires were constantly going flat. after allowing the vehicle to remain parked overnight, the contact would return and notice the tires were flat. the vehicle was taken to an authorized dealer, as well as an independent repair shop, where they were unable to diagnose the failure. the manufacturer was made aware of the failure and referred the contact to a dealer. the failure mileage was 15,000.