I got my Judge Dredd from eBay also and it too had major battery acid damaged MPU so I can relate. Game was stated as fully working but the damage made the start button (so couldn't play a game) and volume controls not work. I didn't have to get eBay or pay pal involved but I did have to call the seller and demand some kind of fix. He asked me to sell the damaged board on eBay (sold for $40 to him!) he then paid for his damaged board/shipping of the board/eBay and pay pal fees/ and the remaining amount for a new board. I bought a new rottendog board and it fixed everything.

That twobits one seems a lot more expensive than the rottendog one and the rottendog one I have has been working great. The twobit site says this board is for Dr Dude too but Its a system 11 not a WPC so I don't know why it's there.

Yes you're right I forgot about that!

Think that was the T3 Gorf fiasco with the color dmd.

Did you repin and put the new connectors on yet that had the battery acid damage? Once you do that it should fix your start button issue. Same thing happen to me and fixing repinning and changing the connectors did the trick.

As for the dmd start easy and check to see if all the wires are connected fully and reseat them including the ribbon cable.

It super sucks! He shouldn't have to go through all this for a "Fully Working" game that he bought from an actual retailer. T.C. Should be not only paying for all the extra parts but helping him diagnose and fix all the problems.