Chopper clogs, I clean it, it runs for several cycles and clogs again. Do I need to replace the chopper or something else? Should the blade on the chopper actually touch the screen part? Because this one doesn't. Should the blade be sharp? This is not. Also if this is a sump issue, how do I get to the sump to check it out?I would be grateful for any help. Washing dishes for 9 people sucks.