D300 arrived back from repair, they not only fixed what I reported, they fixed two things I'd forgotten all about. Now I can put it on eBay with a clear conscience.
Solmeta's cable for the D90 was in the same shipment, and it is way better than the one I lost at Yosemite. Shorter, connectors are more snug. The one which came with the GPS unit was actually for an older Nikon model. They also sent the strap clamp so I don't have to mount it on the hot shoe.