If the arms get bent, even slightly, they will jam. Try pushing on the arm slightly at the slip joint in each of the four directions perpendicular to the arm while pulling. I have to push mine up.
Also sometimes you have to take the joint apart and clean the inner tube. I use silicone spray and a scotchbrite pad. You have to disconnect them at the bottom. Be careful because it may try to wind up some more. You may need someone to hold the part attached to the awning while you clean it.
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins