Hi. I'm Smitty. I am a professional appliance repair consultant here to help you diagnose, and repair, your appliance.
First off if the unit is less than a year old you should call for service under the units warranty. They will repair it for free.
The diagnostics says to replace the pump if doing as you have doesn't resolve th eproblem.
I would like you to do one more test before you replace it though.
With the unit in a drain cycle measure the voltage going to the drain pump. Make sure it is 120vac. If it is less than that please let me know what it is. You may have a main control board issue.
If the voltage is up to snuff then go ahead and replace the pump.
The reason it ran good a couple times and then died again is anybodys guess. That is why I want you to confirm the 120 volts before you replace the pump.
Thank you for trusting me with your problems. The Home Smithy
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Good point. I think I'll try to track down the purchase paperwork and see if still in warranty, or if I bought an extended warranty. This machine is in our daughters home. If not in warranty, I'll probably pull the pump to see if something got beyond the trap and into the pump itself.
One more thing... I noticed when it was spinning and draining, there were some loud clicks happening, like relays pulling in or something, but louder than I owuld have expected. My daughter said they've always been loud. Does that sound normal to you?