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I also found some time to remove a bit more of the belly skin in the area between the waste holding tanks. It appears as if the PO had previously accessed this area. The aluminum sheeting "door" which was riveted in place was different from the main skin. The black water value is stuck in the open position. Not possible to close it. The grey water value stills works..opens and closes. I'm not sure if it's possible to remove the elbow joint and y joint from the thetford valves in such a way as to preserve the joints to be reused later. Trash these and the valves and replace all? Looks like the c-clamps on the valves were installed from above. Maybe I wait and access this area from above? Note the supporting framework for the waste tanks welded to the frame crossmember.
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