Yeah, I have gone to switch levels and it just cycles through as per normal I think.
Next.
OK, this is promising. When one of the IC's on my CPU board went, it constantly cycled through all menu options.
As long as none of the direct switches (ones on coin door) are reporting as open then this is OK. Press each one of them and see if it registers (in switch Edges test). Most likely when you get to the vol up / vol down, it may stick on, or not work at all.
With machine turned OFF and UNPLUGGED at wall, raise playfield (maybe get someone to hold for you, or lock back in upright position if you're OK with this). On the lower left corner (towards coin door) you'll see where the loom from the coin door plugs into a small PCB. Firstly check that it is plugged in correctly and flat (if this makes sense). If it is, gently remove plug and put back on (reseat) a few times. From memory the coin door (and direct switches) do not run through the switch matrix.
If reseating the plug (near coin door in cab) then you'll have to carefully remove backglass and check connector J205 on the CPU board. This plug may need reseating as well. If this does not work, disconnect J205 completely and play a game. If the vol goes up down with this removed, then it will be an IC issue on the CPU board. Many of the WPC boards had batt damage in this area (from memory the U16,U17 (LM339) and U15 (74LS240) control these. If they are the problem, might need to remove the board and send Marks (or Nino in his absence)!. I should have the parts on hand if required.
Don't stress, easy fix.
