I've been to more than my share of 'rent a machine' places to sort out issues like this. There is little accountability for the tools and users take it upon themselves to tinker without consulting anyone else. I would go over the machine with a fine-toothed comb and take nothing for granted.

The pic you have attached shows a Z motor on a PRS Standard. It is a totally different animal than the Alpha. Standards have red labels; Alphas have violet labels. UV values are completely different. Which do you have?

-B