Thanks for the info, but yes I have 2 black tanks. After explorative cutting of the under belly, the 2nd tank is on the driver side, just above and behind the 3rd axle. the easy fix was to cut the cable, and with vise grips, pull on the cable. Yes I did have a long time ago an additional cut off valve installed at the end close to were you would connect the sewer hose. So for now, the OEM valve is open, but is held back by the added valve. The original pull cable for the tank became frozen from rust.
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