Tobin,
a question for you about the control boards
i used to work on one of these years ago and it had 2 control boards, one in the ground control box and one in the platform control box. These boards had many small relays on them. They were small black blocks that plugged into the sockets mounted on the boards. The control box also had 'can' solenoids that controlled the power to the function block coils as well.
Does this sound anything like what you are dealing with?
If so we had a consistant problem with those small relays too, i was constantly having to replace them due to corrosion issues or they would just go bad.
Just something to consider while troubleshooting the control issues you're having with it.
Oh yeah, good luck finding any information like a manual on this unit, grove aerial lifts does not exist anymore and unless someone has a copy of a manual they would share with you, it will probably be nearly impossible to get one. Grove manlift division i believe was bought out by another company and they only provide parts i think. It may be a company called minnpar that took them up. They do have a website, just use that name followed by "the dot com" and you can get their contact information so you can get in touch with them.