Carbon Brush Set

1. Disassemble the drill case.
2. Remove motor brushes, motor assemble and clutch.
3. Press the bearings off the shaft.
4. Reassemble the same way
5. Change out the switch.
6. Install motor brushes
7. Reassemble the drill case and test.

I removed the outer casing and inspected the interior, there was nothing obvious so I ordered replacement brushes and the brush holders because this is what I found to fix tools like this in the past. There were 5 screws to remove and then pried it apart. There was some debris in the cavity which I vacuumed out.
When the new parts arrived, I removed the screws again, and located the brushes and holders. Which I then removed. The brushes were worn but not completely worn down. I replaced them with the new parts and put the casing back together and screwed in the screws.
But the drill did not work. I realized that the brushes were not the problem. So I took it all apart again, loosened the 2 screws that held the electric cord in place. I cut the wire and rewired it, and sure enough, that was the solution. Over time the wires had gotten pinched by the plastic piece that holds the wire in place, it's a white plastic piece that pushes against the two wires. I guess the pressure damaged the wire and cut the flow of electricity to the motor.
All in all, it was an easy fix.

Removed screws in unit took brush holders out put new brush s in new holders and put back together works perfectly old brush s were completely shot

dis-assembled the drill handle assembly, took out the old brushes and inserted the new ones, then re-assembled .

Changed the brushes.