Hi Dave, How's your wheels now? If it's not yet fix try to submerge it into the water to find where leak is coming from. If it's coming from tire, use CA glue and tape to seal it, but better to replace it. I just bought set of tires from Dreamworks and tested one to replace my leaking tire and it works better for the cost of $12. I have to maintain 55-psi of air pressure so it doen't look flat when loaded with fuel on takeoff. Higher than that it goes expand and becomes bigger than original one.