TotalBegginer - You are correct, but the rudder on the 737 is hydraulically powered only, there are no cables or mechanical linkage. However, you have the standby hydraulic system when A and B are lost which along with the leading edge devices and thrust reversers powers the rudder. The stab trim is electrically operated (and if that fails manually operated as well) so hopefully during manual reversion you can trim out most of the elevator loads. With no hydraulics the differential flight spoilers are also lost.