I noticed that when I leave the game on for several hours, at some point, some of the switches become flaky. Most noticeable are the crate, the opto in the Bony Beast ramp and the start button. If I enter switch test, it takes 4 button presses to register one. Those switches are not on the same row/column.

At first, I could leave the game off for some time to fix the problem. But this morning when I wanted to retest, the start button was flaky from the beginning. I also notice that during switch test, the crate does not register anything when I tap it. During gameplay, it does register.

I tried re-seating all connectors related to switches, as well as the flat cable between the CPU and the driver board, to no avail.

So far, after re-seating the switch connectors, the start-button problem has not gone, but the crate and bony beast ramp have not been acting up again. I am going with replacing the start button switch, and call it a fix .

So I replaced the start button, and this has solved one problem. The problem with the crate still appeared every now and them

Yeah, I found that out too. As a matter of fact, this did the trick. It would be fine at first, but after a few hours of operation (idle), it would show up in the matrix as "CLOSED". So at that point in time, I lifted the playfield and adjusted the post so that it shows as "OPEN". Checked with a ball if it still registers, and it did. I was afraid it would now not register when the machine is still cold (rendering it a problem in the eddy controller board), but it still works!

So, two different and unrelated problems, with an easy fix!