Do you actually know what's wrong with it?
I'd guess the drive gears are worn out. The Encore has a different/new drive train, so if they're in fact not servicing the Maestro, it's probably that having parts made and stocking them for a smaller and smaller customer base is not smart business-wise.
Say it needs a new drivetrain, and with shipping to wherever, it costs you $70. How much confidence can one have that in a year or two the motor won't need replacing too? I like fixing things and keeping them forever just out of principle, but eventually, you'll have to put the Maestro to rest and look at (perhaps) an Encore. That's why I asked if you knew what was wrong with it...