Hi. I'm feeling pretty down; the F key was failing intermittently on my 2012 MB Pro. Now the ASDF, all in a row, are not working. I had nearly filled the HD and emptied 300GB, and that seemed to fix it, so I was hoping it was a software issue. However, It's done this again today. I'm typing on external usb keyboard. Please share any thoughts you have on what the problem likely is. Thank you in advance. Also, is there any software I can run to check the hardware, or fix any software issue? Thanks so much!