Problem was worn out chopper assembly. Pretty easy to remove old chopper. Getting the new one in took some effort. Almost need three or four hands to get everything to line up. Also had to replace the check valve as it tore when I went to remove it to check and clean any debris. Decided to replace the spray arm bushing as it showed signs of wear. The upper spray arm spinner is to have on hand as a spare. Seems every couple three years the plastic pin that holds the arm in place wears out and the spray arm falls off. Have to buy the whole spray arm kit as nobody carries just the pin and keeper it snaps into. Dishwasher is running normally now. No loud whirring, grinding noise.