R1 button popped out

My R1 button has popped out and now dos the go back in properly. Is the repair job on this simple or do I have to open it up? If already a post sorry can your redirect me to it :)

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0

crwdns2894050:0crwdne2894050:0

crwdns2889612:0crwdne2889612:0 0
crwdns2892346:0crwdne2892346:0