White buildup on Trigger Circuit Board.

There is a White crystal Material build up on the circuit board below the trigger in my Nerf Hail-fire.

I am unable to Rev the switch and I was just wondering if it’s possible to fix this or if the Circuit board is toast.

its located on the 6 Metallic sauter points on the Circuit board

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

crwdns2934109:0crwdne2934109:0

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