Not sure about the second rattle that you had.
My friend mechanic told me that when they have such a problem, they usually don't even bother opening up the PSE, they change it with a new one under warranty.

I'm gonna push for a new one, can't be bothered with a small defect that will come back later in time.

Good luck with yours.

BTW, I have to add that it doesn't pose a problem at all in terms of driving just this annoying noise but I tracked the car this weekend and it was 100% fine.