I obtained a Namco Point Blank cabinet a few months back from a local guy. He had a small (FREE) arcade as part of his business, but several of the units were non-functional. According to him he had purchased the Point Blank cabinet in auction, had it delivered and it never worked, so it had sat in the corner barely used. That accounts for the condition of the unit and the very low game count.
However, it was sold as spares / repair to me with faulty guns. It's taken over a month for me to find the time to do this, but I decided to trace every wire in the unit after swapping the guns over, reconnecting a lose connection and discovering both guns worked in one position (i.e. if I swapped 1st gun onto 2nd gun cabling it worked).
Last night I found a very thin red wire with a cut in it, replaced the cable and hey presto!
Given the cabinet a clean and here we are, a working Point Blank cab!