Kent, thanx for the response, I was just trying to do the least amount of trauma to this panel and exercise the maximun control. My first attempt, I use a heat gun and turned the flange a medium brown color. It was too slow and uneven, my next attempt I used a shrinking disc, the flange heated up to a blue color (500+ degrees?), the flange shrunk and most of the distortion was removed from the panel.
IMG_20180903_120841.jpg
IMG_20180903_121003.jpg