ED AND C KEYS NOT WORKING

I AM TYPING THIS IN ALL CAPS BECAUSE I HAVE 3 KEYS THAT DO NOT WORK UNLESS CAPS LOCK IS ON (E,D AND C). I THOUGHT IT WAS A SOFTWARE ISSUE SINCE THE KEYS WORK IN CAPS LOCK HOWEVER MY APPLE BLUETOOTH KEYBOARD DOES NOT EXPERIENCE THE ISSUE WHEN CONNECTED TO THIS MACHINE SO NOW I'M LEANING TOWARD THINKING THE BUILT IN KEYBOARD HAS TO BE THE ISSUE. MY MACHINE IS A 2012 MACBOOK PRO 15" RETINA. ANY HELP WOULD BE GREATLY APPRECIATED.