I have a kestrel 140, it has a rudder that is stuck on one side any suggestions on how I can unstick it?

probably …
…jammed up or corroded or 1 control wire is jammed up. U’ll have to disassemble the rudder and inspect everything. check that the rudder pedals are working properly and properly adjusted. Outside of the rudder being bent or a corrosion problem…they are pretty simple devices to fix.

Is it
The rudder blade itself or one of the foot braces?