I lost confidence in my closest Janome dealer... the store employees don't even sew, as far as I can tell. The last time I brought my machine there for it's 'spa day', they had it almost 3 weeks, even though they promised it would be done within 2 weeks. When I called at the 2 week mark, they couldn't find it... it had been sent out to a 3rd party to do the cleaning... I won't bring it back there...
This year, when my machine started to sound labored when sewing, prompting me to get it serviced, I brought it to a local sew/vac repair man. He wasn't a Janome guy, but was very knowledgable. When I picked up the machine, he explained that although dealers tell you it doesn't need to be oiled... other than the wick under the bobbin case, there are several other wicks inside the case of the machine that need to be oiled... He had my machine purring like a kitten in 2 days. I'll be going back to him...