What she would do is walk up to it, type a little, agree that it felt off, take a small flathead screwdriver, stick it through an opening in the side or back of the case, pretend to adjust something, she’d take a cloth, damp it with some of the light oil they used on all the intricate little mechanisms in old computer hardware, wipe the key caps with it. Then say “Okay, try that” and inevitably they were happy with it.

50% chance that this actually changed something, namely the smell of the device. the machine would have an unpleasant smell and people would complain about it without knowing what it is. she goes over it once and now it smells nice, and people are happy. doesn't need any screwdriver for that, that's just for show.