In addition to the great suggestions so far:
Look closely for wear on the playfield above the spinners from the ball hitting the edge of the PF. There should be a black line in a sawtooth pattern. This is worn off on many games.
Ensure it has the topper with working fan that does not sound like it is coming apart when running (both are hard to come by and $$$ lately)
Make sure the ramp flap lift is working as it should and freely.
Flippers should be strong enough to make the ramp shots.
Don't be afraid to pass on this one. There are lots of this title out there and another is sure to come up in the coming months. $3200 and even $2800 is way too much for a game with a missing coin door and worn out parts. For $2800 you should be able to find a completely shopped, perfectly clean and complete example. I would be closer to $2000 than $3000 from the sounds of this one.