Hmm. This is one that could be simple or terminal. It won't be fuse related, I'm sure.
Unplug, open it up and check every single connector between circuit boards. Unplug, clean and reseat each one in turn. I can't remember if the SR5 has a main board with daughter boards plugged into it, but if it has, make sure all the daughter boards are fully seated.
Our usual forum warning applies. Although there are no high voltages around these boards - they're all digital and you won't see more than 5V or 12V, you should still take care and that especially relates to the power supply section if you look at that, as there are higher voltages there.
If a digital board has failed, that may be it.
Do the checks and report back to us.