Here is info on a very compent service person, not AR-authorized, but could do this. When I needed non-warranty service (Luxman) he did as you said, took my info and then called me when he had a slot, so rapid turn-around. I suggest you ask him about this.
Steven Leckrone
The Service Department
30 Unquowa Hill St
Bridgeport CT 06604
203-331-0671
Steven@theservicedepartmentct.com
www.theservicedepartmentct.com
Steven is a great tech but does not like fixing tube amps and last time I checked will not work on ARC tube amps.
Do a search. This question has been asked so many times! Even for your geographic location.