Having just seen two of these and passing let me say.
Know the cost of replacements before you view the machine.
If you can not power on and test... Its a fixer ot parta machine in my book. 1/4 value if the boards look good.
Chech the mpu for alkaline dmg.
Check repo plastics, drop targets, selenoids, Transformer, back glass, and playfield.
Boards can be replaced, so check repo prices.
Make sure the playfirld is not so jacked up that even if you clean and retouch everyrhing else.. They playfield looks horrible.
Check under the playfield for heat stressed coils.
Check your boards, check your connectors.
Check the wood for swelling, and the bottom of the cabinet so it does not fall apart in transit.
Check for rust.
Account for the cost of repinning, and fuses, even some rubber kits are a decent $30 with bulbs and fuses included.
Remember. Its cheaper to walk away. Thrn invest in a bad machine.
The most important thing to check first is THE CORD.
If the cord is hacked and spliced... Check the machine more than you would if it were perfect.
Cut ground? Or one of those replacement end plugs... Replace the whole cord with a new 14ft.