Drain some of the roof motor oil

I overfilled my roof motor. Can anyone think of a way to drain a little bit of the oil without having to take off the whole roof?
 
After I close it the the red light starts flashing. I press open and it stops for 5 minutes before it starts again. So it seems like there is too much pressure which could have been caused by overfilling
 
I might be talking rubbish since I haven't fitted a roof/motor but is it possible that the roof or micro switches need adjusting? This must be worth eliminating first as the overfilled fluid idea sounds less likely.
http://tis.spaghetticoder.org/e85/Z4_3.0i_%28M54%29_ROADST/Slide-tilt_sunroof_and_convertible_top/convertible_top_linkage-operation/
 
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