I don't know who you chose for Denon "authorized factory service" but my experience was 180 deg. opposite from yours.
I used a company called PanurgyOEM in Rockaway, NJ to repair my broken AH-D7000's (right side swivel/hinge broke -- sadly, the one poorly designed part of those phones, IMO). They are an authorized Denon repair center, and have a special department that does nothing but headphone repairs. This pair was out of warranty, so the nonrefundable deposit/estimate was $29, applied to the total job. The grand total was $86.50 which included:
A kit of new hinge parts ordered directly from Denon $25.50
Labor $29 (from my deposit)
Materials $12.00 (packing materials, I think ;--)
and shipping/postage $20
I had them back in my system exactly two weeks from the time I sent them (from Tucson) USPS Priority. I'd say it was one of my best audio-related service/repair experiences ever. Sorry yours wasn't as good, and I'm curious if you used the same company or someone else?
Edits: 05/17/12 05/18/12
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