DIN cables are cheap and they are readily available on Amazon. I could not find any local electronic stores or even commercial electronic distributors that still carry DIN cables. DIN appears to be an older connection standard and there are different types - just make sure you get the right type of DIN connector for the Computrainer.

A new DIN cable solved my roll down calibration issue but unfortunately I had other components that were also damaged which prevented the resistance from changing.

I have talked to other current and former Computrainer users and the DIN cable replacement was a good first step.