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In my C&C Owners manual they recommend in the event of a leak to tighten the "nuts" along the gunnel. It states that you should take care to not turn the "bolt" as that will break the seal around the "bolt" and turn just the "nut" underneath.
There is butyl sealant in between the hull and deck that sandwiches the rubrail inside the joint. The toe rail is not sealed. The hull, deck and rubrail are bolted together with butyl sealant. Basically you just want to suck everything back down, no torque spec was given but I am sure if you tighten these nuts up that should stop the leak.
Also check your stanchion bases. The spinaker lines
on my 32 have put a lot of strain on two of my stanchions. They were showing signs of possible failure. These I pulled out, bolts and all, and resealed.