water would not drain at end of cycle

Went to repair parts on troubleshooting and found check valve assembly to be most common problem. Went to parts diagram to locate assembly and found it somewhat confusing as to exact location. Ordered part(s) on percentage as the problem. Received part next day (great)! Pulled dishwasher out and found I did NOT need to do so to replace check valve which is replaced without having to remove dishwasher. The gasket replacement was not necessary as it seals sump area from bottom of dishwasher and not the valve as it appears on the parts diagram. It took about 2 minutes to replace valve itself and it was the cause of the problem.