Error 34 Can bus damaged
Error 85 Power release low voltage
If is with wiring all ok on the look probably is defective some component like traction electronic unit or hydraulic or steer.
My suggestion is next
Give that forklift someone who know how to measure is it some unit good or not.When you have that men on machine he can tell what is of component defective.
Change unit will effect that machine again work normally,but only when is all synchronized using PC.
Good Luck
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