Dishwasher is draining slowly and not completely draining

Dishwasher is draining slowly and not completely draining

I’m having the same problem with my Kenmore series 665. I’ve replaced the drain pump, motherboard and float switch. I’ve cleared the drain line. The unit worked fine for 4+ years, and now will not drain completely during the cycles. It will drain if I press the cancel button multiple times. Did you ever figure out the problem? If so, please let me know, I’m on the brink of just replacing the whole machine. Thanks!