You should ask on the laundry forum - you'll get better responses there.

Can't say for sure without direct examination or comparison to the sound of the pump on Day 1, but from this position afar, I don't think there's a need to stop using the machine. The sound is very much similar to the pump on my Neptune TL and a friend's Neptune frontloader ... resonating of a pump motor mounted to bottom of the machine's cabinet ... but perhaps a little louder. Unlikely there's a start relay on the pump, they're typically a shaded-pole induction motor. Your choice to call for a service appt for your peace of mind and to confirm if there is/is not a problem. Myself, I'd keep using the machine as-is until the situation gets obviously worse (because it may not) ... as in the pump either leaking or going dead. Or better, I'd break into the machine and examine the pump for evidence of a problem ... but I'm a DIYer and you may not have the ability.

I know nothing about this type of problem. I do know I recently had sears come out to look at my older style kenmore front loader. My washer was not repairable but I did receive a $65 decline of service coupon. This coupon was stackable with all other discounts at sears. The sales person at sears was skeptical as to if the coupon would work but it did.

You could fill the washer full of hot water and run it through the long cycle with a gallon of vinegar added. That will help clean out minerals etc and then I would use it as usual. If it doesnt work, then you can dig deeper for the trouble.