[cknuth]

I have stuck my head into the hatch under the bed. The hissing is coming from the side of the coach, not from anything under the bed. And none of the hoses or connectors in the wheel well are leaking. The action seems to be coming from the forward branch of the seal, right where it splits. Can't see the bubbles - maybe behind the sheet metal. But prodding the seal affects the sound, so I'm pretty close to the problem. Is there a connector right at the seal Y, or does it incorporate a hose from elsewhere? What do you have to disassemble to get to this area? The long piece of horizontal trim is the only thing that appears removable.

Thanks!