Here's the Sensor front side view still attached to it's ribbon. Side view shows it to be a sandwich of glass and filter elements. The whole thing will therefore have to come off. I hacked around the edge of the glass trying to move it with no success but then a wee bit of pressure to the outside mounting plastic and it just peeled away. Just a slight blue green tinge to the bare filter. There is still a glass (?) surface over the actual sensor so it's safe enough from contamination.
Reassembly is reverse obviously, I left a few screws out, not needed in this case and I am thinking of a cold finger to that stainless plate if I can work out a way to seal it all against condensation.
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