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Hi Roger. I know how frustrating that is. Just a thought, make sure the sensing wires (the small wires connected to the line & load) did not get broken or have loose connections. Check the control relay (usually a cube relay), If not and fuse (s) for control are good, next option is the control board. I will search for manual for troubleshooting & let you know if I find one. In the meantime I will opt out for now in case other experts have ideas and want to chime in. I will opt back in if I find something, otherwise, do not rate the service and there won't be any charges.
Manual states -Press and hold Test & Excercise buttons for 6 seconds to reset the controller to its original state at powerup. Until this is cleared, faults are retained in memory and it would remain locked out.