I've got a Steelheader Guide and it also leaks. It's only in one of the cambers though. It'll be fine all day, then the next day it's in need of some air pressure. But none the less it's a grest boat.

As for finding the leak, pump it up all the way and use soapy water all over the suspect tube. My leak is from around the valve. I tigthened it up and it helped but didn't fix.