Shaded surface unable to select

I have this shaded surface inside my model. I am unable to select it. I am trying to boolean union another object but having issues thinking this is the cause. Any ideas what that shaded object is?
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and here is what I am trying to boolean union but it keeps failing.
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Hello - see if SelBadObjects gets it.

-Pascal

I tried the Selbadobjects but didn’t seem to help.
This is what it looks like inside the nose
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when i do a boolean it deletes surfaces at random locations
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extract it, rebuild the surface using the same specs as the original (i.e if it’s 8u 8v, then make it 8u 8v in the rebuild) something got hosed in that surface and needs to be rebuilt-