Googled my washer model, found possible causes and teardown videos.
Checked screen. Was clean and clear.
Checked the pump, was functioning but humming and rattling.
Removed pump for closer inspection, checking resistance across electrical connectors - Was intolerance.
Blade spun freely, but the shaft moved in and out of the motor slightly.
Reinstalled the pump, and ran a rinse cycle. Not draining.
Cleared all hoses of any possible blockage, and ran rinse cycle. Not draining.
Pulled hose hanger from the wall and placed drain hose in a bucket on the floor. Ran rinse cycle. Not draining even though the pump was still humming and rattling.
Ordered pump. Problem resolved.
2+/- hours to diagnose, but only 10 minutes to replace and repair.