30 Year Old Kenmore 665 Dishwasher Does Not Drain

Brand: Kenmore
Model Number: 665 Serial: FH3502298
Main Symptom: Does not drain
**What happens & when: After wash cycle will not drain water. This model does not have the easy remove drain pump. The drain pipe comes out of the lower portions of the bowl approximately 90 degrees clockwise from the brass regulator knob.

Does anyone know how to replace the drain pump or is this a dishwasher a dead duck?**

Error Code (if any): This model does not give error codes
Parts or tests already tried: The filter is clean. The drain hose is clear. Except for draining, the dishwasher runs well.
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