*Only attempt this fix if you have patience, mechanical skills, and have tested the master switch etc for a voltage to the motor.
This was done on a rear coupe motor.
#1) remove rear seat
2) undo screws on side panel and pry out and up carefully.
3) Undo harnesses.
4) undo the three bolts holding motor and lift up and out.
I did not figure out how to undo cables so i did this all while sitting in back of car.
After taking out the two screws holding the silver cap containing magnets:
The main winding armature with unscrew kinda lefty loosey i believe and pop out off of gear inside.
The brushes go where the springs are located and the springs pushes brushes on the COM. MAKE SURE U INSTALL PROPERLY! Hold them in by putting fingers on the copper wire and hold them in and back while installing winding armature.
Brushes and springs:
Clean COM, armature, inside metal cap, and the area of the brushes from all the residue and worn out grease, use the replacement grease on gear area and on spring area(NOT ON COM).
Reinstall with care if brushes are intact and everything looks fine.
PS-This trick works on the Cruise control motor and saved me $500, and mom said i wouldn't gain anything from playing with the ol' tamiya RC truck