Confirmed that one of the fans on my sister's laptop is starting to fail and started the process of getting a replacement part. There are 2 fans in the cooling assembly and I've identified which one is starting to act up, but I'm assuming that what I'll end up replacing is the whole cooling assembly with both fans and the heat sink. At least that way there's only 1 part, not like the time I was sent the exact same wrong part 3 times before getting someone to pay a little more attention.