Left flipper was weak and I was getting a test error with the left EOS switch not firing. It looked pretty fried and I had the parts to rehab the flipper anyhow, so I did. I am almost 100% sure I put the wires back correctly (also checked with the right EOS and it was correct) and I'm still getting no EOS in the switch test. As far as I can trace the wires they are fine, so are we looking at something further back on the main board?
Let me also note that the backbox GI isn't working on this game. I've replaced several components already on the board and still haven't resolved the issue. I don't know if it is possible I damaged anything but if this is of help I can pull up the schematics and figure out what I've replaced so far. I am pretty sure at least both triacs for the backbox (along with their diodes). I also replaced J120 and J121 as they were fried, along with the main power plug (forget which one that is). Had to do a through hole jumper on that one, oh boy. This board has had some work on it, in other words. Most was done supervised or directed by a seasoned tech so it's fairly solid. My next step on the GI was to confirm continuity between the components I replaced but I haven't pulled the board again yet. Really more concerned about the EOS.
Thanks!