Problem with a bernina 730
 

I rescued a bernina record 730,it had not seen activity long enough to get cobwebs 😕
I have taken the side cover, engine cover and base off to give it a good clean ,unseized a few problems ,being the feed dog control and zip zag, but have been unable to get reverse to work?
The rest of the machine is sewing/moving as it should.
any ideas? Suggestions, I don't want to pay $100 for a clean. When I know that all that's wrong.

No help here with your machine, but welcome from Southern Indiana. I'm sure someone will come along that knows more than I do, Meanwhile, enjoy browsing the board!