Hi Dave
The cable is 436202, the lever is 431962. If it is stuck in the down position. You might have to take one side of the transom bracket loose to get at it. I am trying to figure out what is causing this and just have not seen that much. The only thing I can think of is that you are trying to lock the motor in a partial up position and run it that way, like having power trim. That system is not designed for that and needs to be all of the way down and locked to work correctly.
I hope this helps
Marine Mechanic
marina owner for 20+years, certified Evinrude tech