if you have not backed off the star adjuster definitely start there! It's easiest to do and hopefully the strong springs inside pulling the shoes back in can possibly break that chemical bond you think might be happening after the adjuster is loose. Just had to do this to mine when I got it home. Very few people know how to properly adjust drum brakes. They are usually way to loose ( causing to much pedal travel till engagement) or to tight ( and they burn the heck out of the drums and shoes)
