Lower Case 'p' not working with my keyboard. Getting '\p0'

Been having this issue for a few months. My p key will not actually type the 'p' character. I will get some pretty odd behavior from pressing the 'p' key such as lowering my volume to seeing a '/p0' character typed out on the screen.

Originally started off as intermittent. I was originally able to resolve it by spamming my Caps Lock on and off repeatedly to get it to behave normally again. Now it seems determined to not work. The crazy part is if I turn Caps Lock on, I can type capital 'P' with no issues at all. If I spam the Caps Lock on and off now I'm lucky to get a single lower case 'p' before it start acting funky again.

I followed the typical suggestions. Checked to see if it were mapped to another function in Settings - nothing found. Did the NVRAM reset which was mighty tricky when 'p' is one of the characters you need. Still no luck. I even use boot camp and have this problem on my Windows 7 install.

The 'p' key itself is obviiously registering button presses so I'm thinking it's something internal, bad i/o cable or worse. I'm just curious if anyone's seen this kind of behavior and has had any success with replacing it?

I suspect a high cost to repair by bringing it into an Apple store and way outside the warranty. If I'm gonna try to take this thing apart, I want to make sure it's worth my time.