No that's not the problem, pushing will bubble out the cable, no stress
on the return. Think up anothe stupid answer.

Tony Abbott wrote:

On a dual station (cabin/flybridge) Morse s/twin s control system wired in
series we have a problem. If you push the port throttle forward on the
flybridge the throttle opens, but if you pull back the throttle does not
come back. The throttle is able to be pulled back in the cabin. The
throttle works perfectly fine in the cabin. On a visual inspection the
cable between the flybridge and cabin looks fine and looks as though it
moves when moving the flybridge port lever.

Thoughts???