Well done, Steve - feels good, doesn't it?
I just went and had a look at mine. If you pop out the lenses for the motion sensors you will find big torx screws underneath. I didn't try this myself, but I'm betting that removal of those screws will be the key to removing the housing and getting at the switch.
I didn't see anything about it on my manual but I will have a better look later when I get back home. If you don't have a Bentley manual then you really should look into getting one. I think they are about $70 but you see deals on them occasionally here on the forum.
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'99 black 986
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