DB9 Volante rear roof sensor location?

[chriscmore]

My '11 DB9 Volante, in roof open condition, easily trips some rear/open position sensor with a bump or hard acceleration. I know the front hall effect sensor is above the windshield shades, but can anyone advise where a rear sensor is? I suspect a sensor in the roof-trunk is springing around at the edge of its limits and when bounced too far away thinks the roof is out of position. I get the roof operation error message, which then locks out the windows up/down function in the roof switch. The temporary solution is to push the switch closed for a second and then back to reseat everything and hope it doesn't trigger again. I'd love to get at that rear sensor and perform a tweak like that YouTube video on the DB9 roof fix showed for the front sensor, or replace it.

Cheers!