Oh, so sorry to hear! I am fortunate in that there is an excellent sales/repair shop less than 1/2 hour away - and because I've never needed major repairs done!
For regular cleaning type appointments, I can make the appointment ahead and have it done the same day. I have done that; there is a large farm/craft market nearby so I drop the machine off, go to the market, and return later that day to pick up.
A friend had an almost new Pfaff embroidery machine that had to have motherboard replaced. It was in the shop for several months!
Hopefully your Janome will be back home with you soon, running beautifully!