Understood you may not be interested in what follows but for those who have had small problems like me it's worth taking the cover off and looking under the hood (five screws total).
These machines are extremely easy to repair. We've broken a few in our house over the past 20yrs (chocolate chip cookie dough!!!) so I decided to fix it myself after our last breakdown. I have in the past sent the unit back to KA but believe me, even when they're done with it, it will NEVER be exactly the same. That said my last repair job done by myself has lasted over two years. Even if you are not handy anyone you know that can loosen a few screws can repair most KA mixer problems.
3 most common problems:
1) stripped gear(s) (hear a grinding? making bread?) $9.00ea.+ s&h
2) fried control panel (motor not running) $30.00 + s&h
3) New motor $100.00 + s&h
4) Arm won't lift bowl (K5 or K6) $3.19 +s&h
Lots of info on web, including videos of worm gear replacement.
Goodmans and The MendingSshed are great sources for parts and info.
The two I listed are the 6qt and 5 qt stand mixers. The other possibility is the smaller Ultra 4.5 qt which has a hinged top portion and that bowl screws into it's base.
this page lists all four possibilities broken into 3 parts electrical, body, gears:
FWIW I like mendingshed.com better, both shipping costs suck but it's still cheaper than the alternative. If this thread gets moved I'll try to follow with help if I can.
The guy in Salem is the only authorized one in the area north of Boston, and that's why he can charge what he charges. He fixed mine. Authorized Kitchenaid repair shops are deliberately spaced to assure this kind of situation, it seems.
But remember, people, to follow your manual directions on speeds for mixing heavy doughs. The solid state motors blow if you don't. I actually used my Sharpie to mark my dough-mixing speed so I don't repeat my mistake.