Okay so I've had some help from Chris Hibler on this and I don't totally want to keep flooding his inbox. I'm finding the schematic a little confusing and just when I figure something out, it turns out the problem is deeper.

My initial problem:
Game: Monte Carlo
Problem: Left ramp coil stuck up (raises ramp for roll-under) upon turning on machine
What is done: Ground mods (minus under cabinet ground to transformer case which I will do soon), new rottendog power driver board

What I did: Tested under playfield transistor (q5 - 2n5879) and replaced it.
Outcome: I can now turn on the game without the coil firing right up.

Problem now:
Problem: When I hit the start button, the coil locks up.
What I did: Started looking at the driver for the under playfield transistor. Tested fine.
I started looking at the normally closed EOS switch that the ramp opens when the coil
is energized. I tried cleaning it off and adjusting. When I turned on the machine the coil didn't lock
but I did hear buzzing (I couldn't tell if it was from that coil or not). I also noticed that relay coil A and
B were locked. Blew fuse for ramp coil.

Questions: - I'm sure I need to replace that switch. Any other areas of concern? I have also ordered a
replacement driver board to mpu cable.
- Also wondering how that ramp coil is activated. Do you have to shoot 2 of the holes that spin
the roulette wheel and then the left ramp to raise the ramp? Or should it be activated anytime
you shoot the left ramp?

Thanks and sorry so long.

I'm guessing all connectors should be looked at as well.

Just noticed the previous owner did ground to the transformer case. Hoping it's the switch or cable from mpu to power driver :/