The only ECU repair videos I've seen looked like they had somehow removed the sealant -- whether with chemistry, heat or mechanical means I dunno. I'd be concerned that any process that would easily remove the sealant might also easily remove the printed circuit board or parts thereof, but logic tells us that what has been applied can somehow be unapplied given sufficient time and precision. I don't seem to find any of those videos for a 1500, so perhaps you will boldly go where no one has gone before. Suggest you video -- could be giant YouTube hit!
Seriously, unless you have some serious electronics background, and a lot of spare time, the prudent course would be to await sfair's return. As others have mentioned, "he da man" on this stuff. Remember, you don't know that it is the ECU that's the problem. He may come back, look at your readings and say, "Nope, ECU's fine, it must be the __________."
But if you bust it open, let us know how it goes!