It will continue to work through the standby rudder PCU
During electric trim operation, the pilots move the rudder trim
control on the aisle stand which sends a signal to the rudder
trim actuator. The rudder trim actuator moves the rudder feel
and centering unit. This moves the rudder torque tube and the
main and standby rudder PCU input rods and it backdrives the
rudder pedals to the new commanded position. The trim
actuator movement also creates a new neutral position for the
feel and centering unit.
Reference AMM SDS 27-21-00