Why not put together a troubleshooting DVD to cover a lot of the common small issues that arise with a game, not talking major repairs, but how to remove the glass, how to work the computer system, cleaning, simple repairs that come up.. I would imagine that would reduce the amount of calls, and make the new owner familiar with what to do is certain situations.. if you do not want to send a disc, post a link to a "welcome to your new pinball machine video" You could also include instructions on how to do software updates... might reduce the phone calls into service for simple things, and also make the customer a little more knowledgeable.. it is a 8-10K product.. personally I think this would go a long way..