Hi Rob,
System 80's can be a challenge and not too many people out there are experts in them!
Things like ground modifications are essential (easy to do). If your CPU board(s) do not have battery damage then you're off to a good start.
On ANY System 80 I work on, I always insist on the customer purchasing new power to MPU & CPU to MPU connector harnesses
http://www.bigdaddy-enterprises.com/ (is under the Sys1 / Sys80 harnesses link)
Next - the cap's in the lower cabinet. Are they orange? If so these will also need to be upgraded.
