my DH takes care of all my machines.
when i started sewing i told him he had to learn how to work on sewing machines because it was too much time and money to have them serviced by any one else.
i'm very lucky that DH can do these things.
he also services/repairs my washer, dryer, frig, dish washer, microwave, boiler, hot water heater - just to name a few of the things he has fixed in the last 20 years for us.