the two components that are cut off are SCR's. they are part of circuits called overvoltage crowbars. in case the voltage goes to high in the +5v and the -12v sections these crowbars will short out the output voltages and keep higher voltages from getting to the CPU. cutting out these SCR's is not a good thing. a possible power supply problem might have happened for someone to do this. the locked on solenoid may have a driver transistor on the playfield that is bad.

Personally, I would replace the power supply board before bothering to replace the mpu or driver boards.

Having the correct voltages tends to solve a number of problems.

The first step would be to meter everything on the transformers, bridge rectifiers, and power supply board to check for voltages.

start at the start... do not skip a step http://www.pinrepair.com/sys1/

until you repin the entire headbox loom (at least J6/J7 minimum) and rebuild that power supply its not going to work well

I've read that the one from greatplainselectronics.com is good (you may need to contact GPE directly since it is listed as out of stock on the site--someone else said they build to order). Rottendog is probably a close second.

Just finished another batch of these - most of them are at Pinball Resource, the few I kept for myself but sold all within a couple days.
A version of these is also available at Marco Specialties. Same board but they built them.
And there's also John's Jukes up in Canada.