Here's the guide that I give credit for fixing everything: http://www.pinrepair.com/em/index.htm

Here's where to get the parts: http://www.pbresource.com/

.... except for playfield glass. That comes from a local glass shop. He can get me a couple pieces of 21" X 43" X 3/16" tempered glass for less than the parts guys charge for shipping. Sometimes he even remembers to order it without the "bug"(little etched logo in corner).

Looks like you inherited a pretty decent example of a Rack a Ball - congrats and yeehaw!

The #55 bulbs are there because someone had them and they light up at 6 volts. They do not belong in there. The 55s and also the 44s can be replaced with #47 bulbs which run cooler, causing less damage to plastics and backglass.