You will probably need to rebuild part of the MPU. http://www.greatplainselectronics.com/proddetail.asp?prod=BALLY35-BA-KIT

Get an extra 5101 and socket.

Here is a list of stuff I wish I’d bought when first starting in the hobby. I own all this stuff now, but struggled with lower cost alternatives until I threw them away.

To do the MPU board:
Hakko 808 De-soldering Gun:
http://www.tequipment.net/Hakko808.html

Here is a thread on the accessories you should also get:
"https://groups.google.com/forum/?hl=en#!topic/rec.games.pinball/5wOjTleVUOw"

Soldering Station:
http://www.tequipment.net/HakkoFX888D-23BY.html

A good 3x lighted magnifying lamp:
http://www.amazon.com/Daylight-U2203001-Slimline-Magnifying-Lamp/dp/B000WV6092/ref=pd_sbs_op_8

Professional Grade "B" Type Crimper For 0.156" contacts (yes I spent the $100 after getting tendinitis in my elbow):
http://www.greatplainselectronics.com/search.asp?pg=1&stext=3136-CT&sprice=&stype=exact&scat=

I usually rebuild the rectifier board and replace the .156 connectors because they get burned up,
http://pinwiki.com/wiki/index.php?title=Bally/Stern
http://stevekulpa.net/pinball/as-2518-18-wiring.htm
http://www.southjerseypinball.com/stern/ta-100-16bwiring.png
.156 (Trifurcon) & .100 connectors

IMG_20120619_091735.jpg

First link above.