EDIT: Brake drum is stuck! Now, how to loosen it??????????

I recently purchased a Clark GPS20MB at auction.

335 Hours Showing, no idea if this is accurate. Mitsubishi 4G54 2.6, single speed, pneumatic tires.
Machine is clean but has been painted at least twice. In the description it was noted "This lift came from a local stove and pellet company. They said that sometimes it moves and operates for days then it will stop. Once it sits it works fine again."

I cannot get the machine to move, hydraulics all seem to work including steering. Checked Oil and Hydro fluid, both are at correct levels. This machine has dry automotive type brake drums and shoes with one master cylinder.

I jacked the front wheels off the ground and I can only get one wheel to move when I engage fwd or rev. I cracked brake bleeders, no change. The same wheel can be spun freely while in neutral, but the other wheel cannot. The bad side has about 1/4"-1/2" of easy play and then locks up hard, this makes me suspect a differential or something other than the brake. Basically the brake backing plate is fixed but the drum will move fwd and back just a small amount. I forgot to test to see if this same movement is present with brakes applied, I will do that tomorrow.

Does anyone have any ideas before I pull the hubs and shafts? Should I trans and look for metal first?
Could this be an inching valve issue, on just one wheel? I do not know how to bypass.

I have copies of both service and owners manuals that I found online.

THANKS!!!