I hate to be blunt, but if this is over your head...
...you need to call a general mechanic.
Any competent mechanic can repair your freeze drier without regard to the manufacturer (one way or the other).
It’s a ‘minor’ repair (almost ‘eyes closed’ for those of us so inclined).
I cleaned the pump regularly. You take off the front and there’s a gasket on the back cover that connects to the body. I know what it needs, I haven’t been able to find the parts I need. The sites want a model number and I can even find that on the pump.