I believe there are some musical instruments stores in your area. They usually have or know folks that repair MI amps. You might try checking with them to see if they can recommend a good local tube tech that knows their way around hi-fi amps as well. Just a thought.
After several hours of googling and sleuthing that would put Sherlock Holmes to shame... I think there is an off chance they could be Bose. Possibly one of the 601 series. :D
All I can add is I have 'reprinted' mailing labels numerous times via eBay win pc chrome browser and/or via the eBay app on my android phone. Never have i been charged for postage twice for one item.