If you are lucky to have found a good repairman you can trust you are one of the very few! I do my own tune up for all my machines, even the computerized one. I bought the machine repair books. The most important thing to know is how to open the top of the machine the right way and put it back. The rest is just cleaning it out. The computer machine component part doesn't need maint. on the computer parts. It works or it doesn't. Time for a new board if the computer messes up.