Possible Bad Volume Rocker - should I have it warrantied?

[Q_Q]

My up volume rocker is creaking upon selection.
It doesn't have the solid snikety snick sound of the lower volume rocker.
It also seems the selection balance between the up & down is not even.

I feel I have to press harder to select up volume than lower volume.
Spoke to HTC customer support & they feel it's probably the pad below the up rocker which is probably loose.

I have had the phone for about 1.5 weeks.
Things tend to fail either sooner rather than later is always my opinion.

Should I get it replaced by Sprint?
Will they provide a new one or a refurb?

Advice appreciated.

TIA