Help...Froze rear rotor

[gwomack]

Drivers side rear rotor is froze. All the other ones are off and fine. Any suggestions? I have used penetrating spray and a rubber mallet. It won't budge. I suspect that it is a parking brake shoe problem. Is there a way to release the tension on the shoe? The passenger side rear shoe didn't prevent the rotor coming off. I need to get this off by Friday morning so I can get them turned before the weekend. Other wise I am out of commission until next week (if I get the dang thing off). Any help would be greatly appreciated.