Is anyone willing to suggest or share wording on a contract to protect me from numerous trips to the customer's home to re-program after they do something to mess it up, or when I get there and discover that there is nothing wrong but their ignorance or they decided to see how it all work and accidentally disconnected a component or reconnected it to the wrong jack? I am looking for some friendly wording to make it clear that anything after my initial training that results in my having to spend long telephone conversations or trips to their home that are not related to faulty product or installation will be their responsibility to pay for. In other words I don't want my "warranty" of the product to be misconstrued.

Any examples or suggestions?
Thanks