I have a Jungle Lord that has been in storage a few years. I put in brand new pinpcb MPU, Driver and power supply board. Game won't boot and has a error code 9.

From my research it states that a code 9 "Coin-door closed, memory protect circuit faulty, or IC19 CMOS RAM Faulty". I guess I am assuming the memory protect circuit and CMOS RAM is okay, since these are brand new from pinpcb. It then tells me to check for coin door closed (or pin 1J4-1 or 1J3-1 is being grounded).

My question is how do I check these two things?
How do I confirm a pin is being grounded?
How do I check that coin door is closed? I know I can check the coin door by closing it, and I have, but is there wiring that could be bad telling the game its open?

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