A couple of red flags in that video...
First, note the "credit dot" on the DMD after the words "free play". This means that the machine's software has detected a problem. This problem could be very minor (a switch needing adjustment) or very major (a mechanism is not working).
The cannon mechanism on T2 can be problematic, and he does not show the cannon working in his video. I wouldn't be surprised if the cannon is not functioning and this is why the credit dot is there.
Also, note that the ball gets stuck right at the end of the video. If it happens in his 1-minute long demo, you can bet it must happen a lot. Maybe this will be easy to fix, but it is likely there is a divot in the playfield at that spot.
Also, at around the 0:56 point, he hits the drop target underneath the terminator head, and none of the arrow lights for it come on. I don't think this is correct (though I am not an expert on all of the T2 rules), it may be that the drop target is not working properly.
None of these issues are huge, but are probably worthy of further inspection.