Hi Ron,
I just attempted to phone the Authorized Singer Service center in Bellevue WA, and got a 'disconnected number' message. My google searches have turned up zilch for Singer Authorized Service Centers anywhere in the Pacific NW (WA ID OR NV). I know it's asking a lot, but any chance you know of a good (Singer embroidery) service person within 500 miles of Portland, OR?
My Quantum XL5000/6000 is due for its 600,000 stitch check-up, and when I took it in at 300,00 stitches the local shop damaged it. No way am I trusting them with it again.
If all else fails, are you still able to do a routine (not warrantee) service? Nothing seems out of order, except an occasional tension (not certain if it's bobbin or needle) issue, but I know it should probably be professionally cleaned and lubricated. I would ship it to you before I take it back to the local shop.
I am seriously bummed!