Somehow I ended up with 2 non-working Defender cocktails. A complete NW from Coinopwarehouse, shipped via the ever reliable Love, ChrisChris & Martin the deliveryman and one from a UK collector. Finally got round to looking at these yesterday.
Machine 1 - some dodgy connections on the power loom to the PCB (need to repair at a later date but it will work with a little wiggling) and a ROM board that did not work. Swapped ROM board out from other machine and bingo. Tested CPU PCB from machine #2 - this is showing RAM fault, that is for another day.
Machine 2 - No power. Original US style lead / plug broken, so cut back to a working part and new plug fitted. Power at the machine but 12V LED missing. Replaced fuse and all voltages correct. Fitted the now working PCB set from other machine and it also fired up. Currently machine has PCB showing RAM error and ROM board that boots to Rug screen.
In the interests of QC, I played a few games on each of them. Other than the PCB issues both are fully working. Damn is the cocktail version hard to play.