Rns-D Right side buttons are not illuminating

The Right side buttons of my Rns-D unit are not illuminating. I have desambled the hole unit and powerd up each led and it seams that all leds are working. Any ideea how to fix this problem?

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

crwdns2934109:0crwdne2934109:0

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