Head set tracking and steam not reacting

SO here is the long and short. for three years I've had worse and worse issue with my right controller just stopping tracking it just falls to the floor and still moves my button presses but no location tracking. well now that I'm past the warranty period i finally got some one to not just tell me to resend the error data for the 7th time. they said repair the interior tracking parts in the headset as the error seem to implement the headset. However they also say they have no idea what that is. so.... what part do i need to replace here. I can't afford a new headset just to test that's the issue. this has been long and drawn out and i cannot even play in vr any more its bad bad.