Ended up getting it for $6,600 and just tore in to it today. The AOS/PCV diaphragm was my assumption as well and it was definitely torn. I found a place that sells just the diaphragm so I replaced that this afternoon. I need a new intake gasket to finish putting it back together Monday but I can see why they charge 800+ to replace this little $20 bastard. Tons of room in the engine compartment but still a pain. Nice little engine though.
