Because the sounds seem to come from the flywheel (it seems like a bearing issue to me), I will certainly be interested to know if the "bad crank" diagnosis becomes the long-term solution. If so, I will need to make a similar warranty request and push back on the "it's normal" diagnosis, which doesn't seem right. At this point, there aren't many Echelon bike owners (owners of different models) visiting this thread, confirming that the sound we hear is normal for all Echelon bikes.
I paid full price at Costco ($999) in December and then got a price match when the bike was discounted by $200 one month later. So, I am in the same situation about another potential return: Getting a full refund and then needing to pay more to bring home a new bike from Costco, if I choose to do so at some point in the future--which I really hope I won't need to do!
Keep us posted, okay?
Will do!! I have bookmarked this page and reply when my new bike is received. Could be two weeks out. Im hoping others find this page. I know there are other posts with similar concerns.