My "R" key seems to be broken. The key itself seems to have a hinge on the left side of the key and it allows the key to swing up. Underneath the key it looks like there is a box like attachment that the key should click in to. On the underside of key I think there are 2 small circular tabs that look like they are the parts that attach to this white box. I think one of the small circular tabs may have broken. Any advice out there on how to fix it? If i click the "R" key back down it clicks back in perfectly but then will pop up again when I start typing for longer periods of time. I also, do not have Apple Care and it is a 2011 Macbook Pro.