We picked up a T2 a few months ago... was our first machine, so admittedly we didn't really know what to look for. After going through the machine, we found one of the previous owners liked to use drywall screws in place of the correct screws, and even started adding new things.
The real major dissapointment are the 2 that came up through the playfield in the pictures.
But on top of that, the cannons switches weren't configured right, so the gun was shooting the playfield objects during its shake loose. I've probably pulled 8-10 of these huge drywall screws out of the machine. I thought the 'shielding' was a nice touch.