It appears that some of the fan casings for the 2nd-gen X1 Yoga didn’t receive the care and attention they deserved at the manufacturing plant. The little plastic clips that connect it to the copper plating are sometimes the wrong size, or simply don’t clip at all.
This, of course, results in a rousing rendition of the most annoying sound in the world, of which everyone in the office it thoroughly appreciative.
Depot RMA on these things is a 4-6 week process, at which time they will replace exactly one part, possibly from the same batch of junk they put in there in the first place.
Luckily, there’s a 20-minute solution:
Never fear to MacGyver that business.
Provided you know what you’re doing, of course.
My name is moderately common, as are a couple screen names, so always look for the logo to make sure you're reading something with official Km approval.