Kitchen Aid Dishwasher Does Everything But Wash

Model Number:
Brand: Brand
Age: Less than 1 year

Model Number: KDFE104DSS3
Brand: KitchenAid
Age: 1-5 years

Hi, I have a Kitchen Aid KDFE104DSS3; 3 years 8 months old. Anyone have suggestions, please?

Repair shop said about $300 to $550 to fix. Original cost $560.

Condition: cycle set on Normal Wash, wash completed but arms do not spin and detergent was released but did not dissolve; dishes not clean.

Actions and symptoms:

Reset (breaker off then on).
No leaks or blockages; filters clean; wash arm holes open, no blockage.
Self diagnostic test - no errors; run twice.
Fills tub and arms do not spin.
Fills and drains OK during self test.
Diverter disk closed under wash arm after test.

Anything else I could do or test to determine problem and what part should I replace? Your advice appreciated.