I would continue to bug the dealer who sold the machine to supply the manuals. An old machine without manuals is almost worthless unless you already know a ton of things about that particular machine.
Don't give up. Keep after them for the manuals.
In the mean time I hope someone here has something close to what you need.
Your problems are probably not parameter related unless at some point the batteries died on the control and they were lost. Servo parameters are usually set once and never changed again.