Your best hope is to go back to the tuner and see if they will give you the map.
From HD's point of view there is really no need to be able to extract a Map from the ECM because you would have had to load it in the first place, therefor you should already have a copy. Unfortunately many don't find out they need the map until after they have had the bike tuned at a place that doesn't give out the maps. IMO, that is just plain WRONG. I feel that if they are not willing to give you the Map they probably did/do little or no part throttle adjustments and little or no timing adjustment from the base map they started with and have something to hide. When you pay for a Dyno tune you are essentially asking them to create a custom Map for your bike using your SERT (or whatever tuning device). If they fail to supply you with the Map after how would anyone make fine adjustments based on small changes at a later date?
Some places just give out excuses like "I don't know how to do that" or "it can't be done".
For anyone reading this and thinking about getting a tune, the #1 question I would ask is "Will I get a copy of the map(s) when it is done?". If the answer is no, walk out and don't let them do the work.
Just my 2 cents...