looking for a P337 Rear vacuum relief valve

[weebyf15]

Nope; Skymaster experience up here in the Florida Panhandle is hard to find. I am open to any and all suggestions. Been through three Mechanics, all were frustrated with the complexity of the P337. I don't push them, I'm pretty laid back. They all just want to work on something that does not get a write up every time It flies (which is getting very uncommon). I'm trying to view this as a marathon not a sprint, but....... Frustrating.