That is what is to be done!
They are to go over the entire machine clean, oil make any adjustment & if it is anything major or out of the ordinary they are to call you & ask if you want them to take care of it.
On that note I also have a Janome I took it in for reg maintance cleaning all the usual stuff sense I got it back it has been ione thing after another. Now it is been sent to the company when I ask about how long it would be gone there reply was NO IDEA not what I wanted to hear I've already been withou a machine for longer than I care to say.
I have had this brand of sewing machine for years & it is not your bottom of the line IT IS THE TOP OF THE LINE.
GOOD LUCK