Thanks to HappyDude for the info. I just did this and it seems to have resolved the noise. A couple of notes:
It's a T15, not T20 bit, at least for my 2014 X5.
The T15 fit perfectly, but the screw wouldn't budge. As I tried to turn it, it actually broke. There was no unscrewing it now, but I figured it must be a very soft metal. I used a long flat head screwdriver and a hammer and a couple of light taps broke off both sides. Obviously this isn't ideal, but want to share in case someone else runs into a broken screw.
While I had it open I went ahead and applied a few dabs of white lithium grease to all the moving parts. Quiet as a mouse now.
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