Hardware Controller analog issue... uncalibrated or damaged?

[TripleSMoon]

So, I received a Best Buy refurbished XBox 360 as a birthday gift a while back, and I finally managed to get it and bring it to college with me. I played it for the first time today, and it worked absolutely PERFECTLY, except that the Y+ axis on the included controller's left analog is EXTREMELY insensitive. No matter what I do or how far I press the stick, it won't register anything but an EXTREMELY light press. Altair and Marcus Fenix essentially tiptoe everywhere, and it's really annoying. The control has no sign of physical damage at all, and looks brand new. There's also no telltale jangling when I shake the controller to signify that anything is "loose" or broken inside. It's literally in perfect condition aside from this one issue.

Anyway, I'm pretty sure the refurb is under a warranty, so I can probably return the control for a new one. But I'd rather not do that cuz A) The closest Best Buy is at least an hour away, and B) I don't want to have to wait for a week or two to be able to even play my XBox since i'd have to mail the controller in.

That said, does anyone have an idea of what might be wrong, or whether it would be repairable if I were to crack the controller open? Or am I better off just sending it in, and buying a new one in the meantime so I can play now?

 

[DinohScene]

It could be a loose contact or worse.
The sticks assembly is busted.

You could crack it open and check the soldering around the stick and resolder any loose connections if applicable.

 

[Sicklyboy]

If it comes down to it, tmart.com sells replacement analogue modules - http://www.tmart.com/Analog-Replacement-Switch-for-Xbox-360-Controller_p118009.html

Let me tell you how much of a PITA time I had trying to get mine off lol. But I also wasn't exactly desoldering it properly...

 

[TripleSMoon]

Thanks guys. I'm not exactly a soldering specialist, so I'll just get it replaced with the warranty (already bought another used controller in the meantime). Thanks!