Hi, I have a Beosound 9000 mk3 with two issues regarding the glass door mechanisme: 1) Pushing the glass panel button does not respond the first time, it requires several presses before the glass panel opens. 2) The BS9000 is in slant position and when it opens up the glass panel it stops halfway but the motor keeps trying, is it a belt issue?. If so where to find such  and is it easy to replace yourself? /Pindsen