PSA: check your idler pulley!
In the last week or so my car developed a squeak on start-up, so I picked up a new idler and belt just in case. I pulled the belt and spun all the pulleys and they all felt smooth and made no noise. But when I pulled the plastic idler, I found this:
Now, the car is in the midst of some work, so I wasn't able to verify that the squeak is gone. But regardless if it is, this pulley needed to be replaced. So I figured I should show the other owners of this kit that may have the same pulley, in case there was a bad batch of bearings.
FYI, I replaced it with a Gates 38018 pulley.