It's about an hour from Northern VA, but Used Bike Emporium near BWI will work on it. The owner has a pretty nice collection of vintage KZ's in the showroom, including a mint all original ELR.
Have you thought about doing it yourself? If you're sure it's the valve cover gasket, that's a relatively easy job. You're not really getting inside the engine. It's a cover. Remove the tank and it's 10 or 12 10mm bolts. Spend the money you would have been charged for labor on a decent torque wrench...not Harbor Freight, but not necessarily Snap-on either. Sears/Craftsman would work fine. I'm sure you can find the torque spec on line. Tighten bolts in a criss-cross if the manual doesn't give a torque pattern. You'll be done in an hour and know a little bit more about your bike.
