My SSB (installed by Amel) is no longer transmitting.  It was working up until a few months ago.  I'm looking for troubleshooting ideas???  It still receives just fine.

I checked the ground connection at the rudder and it appears to be in good condition, no corrosion. I also checked all connections at the controller and main unit, they were all tight and appeared normal.   

Any thoughts would be appreciated.
Duane
Wanderer, SM#477