I agree, I think corrosion from salt/dirt/water is probably the culprit. Since it happens with both cables, I think the problem is where the cables connect to the release levers.
I think there might be dirt/corrosion/salt on the ends of the cables, which is preventing them from sliding back smoothly. I would start by inspecting that area, and maybe even lubricating the ends of the cable wire to see if that helps.
Last edited by apexi; 03-16-2014 at 12:03 PM..