850i gearbox problem/Repair manual

I have a 1993 850i and I have a gearbox problem.
Sometimes it works, sometimes not.
I assume its an electrical error...
Does anyone know anything about this or do you
know how/where to get a Repair manual?

BMW Rocks!

assuming it is the EH automatic, they're many variables in the M70 cars to cause this. need more detailed info to possibly help you.