Ok, I had some confusion about which connectors supply 50v and 12v power and where those connectors are being fed from. After tracing connections using the manual and properly understanding which connectors fed what power to what boards, it seems the actual issue was due to the J104\J105 connector\plug having some connectivity issues and therefore not enough power was coming from it to the fliptronics board. After cleaning that plug it was able to feed the necessary voltages to the fliptronics board and the flippers came back up to full power. A very weird issue to figure out.
I am leaving the machine on now to see if the J116 fuse blows again (before it would not go but a few hours before blowing).
I am still not able to test solenoids via the Test menu. No matter what solenoid test I choose, only the Deadworld motor activates and does a herky jerky spin. I saw this when I had a cable connected to J136 (I think) on the power driver board which wasn't supposed to be there but now I am at a loss as to the cause. Any ideas?
Just FYI - I bought this pin after being routed and who knows what other history it has. I have found 2 connectors (purely by chance) that were plugged up incorrectly and causing very random issues. I plan to go back through the manual schematics and verify plugs are where they should be.
Please let me know if you have any questions about anything. Thanks for your consideration.