Any update on the repair?
Just curious, does the drill run and then stop under load? Or, does it run briefly and then just stop? If it runs and then feels like something is slipping, but then runs when not under load I still suspect it might be brushes. At any rate, if you're ready to move on there are almost always good Christmas sales on cordless drills!
With an 18v battery running $30 - $70 I have almost decided it is time to consolidate brands. I have a much newer 18v Milwaukee impact driver with two good batteries so I will wait for a sale and get a new Milwaukee drill that comes with two batteries. For about $50 more than a single battery I can get one charger off my bench and carry less spares in my work bucket. Some one at goodwill will get a nice used drill/driver and charger that still works fine for lighter duty work. Thanks for asking.