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Dave,
I believe it is up behind the shower. The access panel is in the pantry. I haven't checked myself but I'm going to now. I was not aware they would fail that often. There should also be a one page description and drawing of the flush system in your manual packet.
I did find a another spring loaded sewer vent that terminates in the void around the garden tub (serves the gray tank). It is behind the right hand inspection panel. I found it right after we took delivery while tightening fittings. The vent was actually laying on the floor because they forgot to put it back on after pressure testing (I assume).
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