This sounds a lot like blown variable channel FETs. I blew the FETs on both of my variable channels due to derailments. I replaced the FETs on one channel and it works fine. I will eventually get to the other one. I am not sure which TIU revisions are prone to this problem. The symptom I had was voltage passing through at a constant level. The red button on the remote did not shut off the power to the channels with the blown FETs. There are a number of posts on the FET problem.
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