Rudder
Rudder hardover evidence is the pedal displacement and hardness .Nothing about this is declared for pilots.
From Boeing about RPR: Valves like this have proven to be reliable in-service. However,service history has shown that if the valve does fail the regulating valve tends to jam in the nearly closed position,resulting in zero output pressure.Therefore , the predominate failure mode of the RPR is ZERO pressure.
This failure is indicated for A FLT CONTROL LOW PRESSURE light in P5 and MC
Boeing add : An RPR failed low not significantly effect flight characteristic whith both engines operating.
However on all classic models the amount of rudder available is reduced whith the RPR failed to low pressure .This affect the rudder available to counter hight crosswind conditions .However sufficient rudder and lateral control is available to safely counter the x wind levels demostrated during certification testing.
Prtectthehornet: the low press condition ( 1000 psi) is to 1000 ft in takeoff and 700 ft in aproach.