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Ron-- If your unit is like most other units that Montana builds, the black tank is directly under the toilet with a straight drop into the tank. Montana along with all the other manufacturers do not have any diagrams for their wiring or plumbing. You can drop the coroplast on the side the toilet is on and you should have no problems getting to the tank to exchange probes or sensors. I don't totally remember the floor plan for the 3160 but I'm thinking the basement back wall can be removed to find the black tank also. I've removed mine to insulate the back basement wall and the black and gray tank for the shower were both just behind that wall and was really easy access if it wasn't for all the wires and pex running all over the place. Good luck and let us know what you come up with.
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