I think I have 2 rampage pcbs. I plugged them into xenophobe and they came up. I just did not do any other tests to them. If you need one, let me know. I think I know someone who has a cab I might be able to test them in if you want 100% tested.
I would think it would cost more to repair than to replace..
I know I have 2 tested working ones but I have no Idea what the going rate on a board is these days. I know shipping would be at least $20 due to the shear size of the PCB maybe a few dollars more with the metal plate.