Dishwasher Won't Drain

My GE dishwasher, model GSD1300N00WW, won’t drain. It cycles fine but leaves water to about heat/dryer cable high. There’s no blockage at the drain. I’ve also tried baking powder, vinegar & boiling water to double clean any build up. It still wouldn’t drain.

I can’t feel the "ball" in the sump valve. Could it be stuck?

how can i tell if the unit is beyond repair? This is a basic model that is 5-10yrs old. A motor is $150+/-. Is my only "repair" buying a new dishwasher??!!