Open sliding roof by about 20 cm (8 in.).
Press away the front panel lining with a smooth, flat lever.

12100001 - click to zoom
 
Close the sliding roof.
Push back the lining.
Turn back the retaining spring.
Remove the guide.

12100002 - click to zoom
 
Pull the keeper plate away from the guide.
Remove the keeper plate and guide.
12100003 - click to zoom
 
Warning: Before removing, mark installed position of
guide.
Remove guide on the opposite side in the same sequence
of operations.
Lift out the sliding roof panel.

12100004 - click to zoom