I have an older Bernina, no warranty left. I watched a youtube video and took the housing off and cleaned my machine. DH had the srewdrivers needed, one was odd looking.

Years ago I had an awful experience with a shop that happened to be the only one in my immediate area. I took it in and got an estimate on the cost of a maintenance check plus the stitches were not quite right. Also was told that if they found something that would cost more than what I was quoted they would call. Well I never got a call except to say it was done and picked it up only to find out they were charging me triple what the estimate was and the machine was still doing what it was doing when I dropped it off. Needless to say have never been back to them and pretty much learned how to care for my own machines.