it says "complete overhaul" (komplett überholung)
Yes, that's correct, but I was confused by the handwriting, at first glance I've read "Komplettüberladung" which would mean "total overcharge", which I would have interpreted as "this turbo pump was overloaded and borked".
BTW
Did one ever see such a turbomolecular pump explode? There's quite a bit of energy stored when running at nominal speed. Test chambers usually are buried underground or have wooden planks at all walls to absorb the shrapnel.