How to fix the trigger in my ps move,which is not working?

i've tried opening and take a look on my t button, ive never noticed any physical damage.

please help me. I'm new to repairing.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0