To get a new lapel roll or to make a 3-roll-2 jacket from a normal 3 button jacket I made this video:
The result of that is flattening the roll again.
Really, the neck is what decides where the lapel will roll. If dry cleaners have pressed your lapels flat, maybe you can press the crease they have created out, but don't press it again all the way, just a little below the neck then let the lapel roll naturally. Although by that time, the tension and curve created by stitching (padding) the canvas to the outer shell might have been destroyed anyways.