Thanks for the tips on posting pictures. It worked !
This view shows the rudder bracket which is bolted to the hull. To get to this point, remove the rudder pin and slide the rudder off the bracket. The rudder bracket is held in place by two bolts. On our sail, the lower bolt worked itself free, then after about 10 minutes, the top bolt pulled out.
Note: In the fully assembled state, the bolts are hidden/covered by the rudder pin. To check the tightness of the bolts, the rudder pin needs to be removed first.
This is the rudder bracket. Not sure the reason for the short amount of bolt which is threaded into the hull fitting. Only thing I can think of is that this serves as another built in point of failure meant to protect the hull from cracking. Don't think that is the case though, as the rudder pin should fail before then, releasing the rudder assembly from the hull.
I really would like to replace the existing bolts with longer ones. This should pretty much prevent the whole assembly from separating from the hull, but am not sure if this would void the warranty.