I'm a noob when it comes to Pinball repair but I'm willing to learn. I've done a lot of research so far but I have some pretty basic questions about my newly acquired TOM.

----My first issue is a ground short row 5 white-green R5. I've unplugged the row and column from the bottom of the CPU board and turned the game on and the ground short goes away. I guess this tell me that I have a playfield issue. Is there a way to find out which switch the white-green wire goes to so I can trace it out?

---I found a wire that was exposed and grounding out on one of the arms. I taped it up and my ground short is still present. Could this have been the cause of the ground short?

---Third issue is my trunk opto board or wiring seems to be malfunctioning. The machine has a Great Lakes Modular opto board installed but opto4 is always open. When I interrupt the opto4 signal, it still shows open when it should be closed. I've sent an email and a Facebook message to Great Lakes in hopes of sending the board in for repair if needed but I've received no reply. I've read that Great Lakes is slow to respond or doesn't respond at all. I've also unplugged the trunk opto board to see if that was the ground short problem but the ground short is still there when unplugged. Could this be a wiring issue?

---With the opto board error, the trunk had spun continuously causing the wiring that runs through the trunk to twist and break. I've seen references to a trunk stop http://www.marcospecialties.com/pinball-parts/A-19933 It looks like my trunk doesn't have this piece. Is this piece an OEM part that should be in the machine? How do the wires keep from twisting when the trunk rotates so this doesn't happen again? I'm assuming that when I get the opto board fixed, this issue will resolve itself...

---The OEM plastic interrupter is cracked near the screw that secures it to the shaft. I ordered an aluminum interrupter to replace it.

---J121 has been burnt and it looks like someone used electrical taps to get power for the GI from the other pins. Is this an OK fix or should I fix it properly with a new header pin and connector?

I'm having fun learning about this machine and hopefully I can get it up and running with your help.

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THANK YOU! I found the switch matrix in the manual. I knew there had to be a schematic or matrix that showed where the wires go. Thanks to you I found the culprit for my ground short (I think).

I unplugged the connector on this board. I think it's called the eddy sensor board. Am I correct in assuming that this board is causing the ground short?

I still haven't heard back from Great Lakes

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Yes, when I unplugged the eddy sensor the ground short message went away.

Thanks, I looked at the board and didn't see any signs of visual damage. I went ahead and ordered a new auto eddy from pinbits today.

Now I just need to figure out what's going on with the opto board and if I need to buy the trunk stop...