Unfortunately....you can't. About the only way to find out is to call Mesa direct ly and give them your serial number. They should be able to tell you from their records.
Any idea how they are in dealing with second-hand amp owners?
I've had to order a footswitch cable from them, and I don't think I'd fully let off of the "send" button when it showed up at my door! But I've never had to deal with them on a "personal" basis.
The people at Mesa are honestly some of the nicest people that I've talked to. They are very informative and helpful. They don't care if you're the first owner or the thirty-second in a line of owners. They treat everyone equally, and are willing to help in any way possible. You shouldn't have any problems getting that information. Good luck buds!
