"t" key always pressed on mac
I hate to be the bearer of bad news, but most likely your "T" key has a crumb of food or some dust stuck underneath it.

Canned air sometimes works, but sometimes will jam it in there for good.

If it's still under AppleCare, bring it in to an Apple store and look distressed...sometimes it helps to cry a little bit and/or beg. Personally, I just grab a Genius' pant leg and refuse to let go while sobbing loudly.

Generally they can replace the key and/or keyboard, but you may need to go without your laptop for a week.