You should start at the pump to be sure there is not a problem with the solenoids or motor first. Then, if they function properly with 12 vdc applied you could have a control problem that might be repaired as you think with replacement of the controller and touch pad.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7