Referred me to muellers who seem to be extraordinarily disorganized
There is not much needed in way of maintenance but;
Make sure you keep some lube on the rails and the feed screw. I use grease on the feed screw and way oil on the rails.
Every so often you can take the machine apart to inspect the brass gears for signs of wear. Replace if needed.
In time, the brushes in the electric motors may wear out, as they do in any electric motor. I had mine for several years before that happened. I don't think it is necessary to tear the machine apart to check them, though.
Check the drive belts for cracking. A little belt dressing can be used.
Always check set screws on everything to make sure they are tight. I've never had one work loose but it is good habit to form.
Next time you call Muellers in regards to the Model B, make sure you ask to speak with me. The people that answer the phones are very well trained but there are 7000 items in stock and I don't have time to train them in the inter-workings of a lathe.