Can anyone tell me if the screens covering the water intakes on a 2001 340 Sundancer are bonded to the Zinks? I had a guy check my boat, and he said that everything appeared to be bonded correctly inside the boat. However divers that maintain the bottom of my boat indicated that the screens on the intakes had a lot of corrosion on them. Also, can anyone confirm that the screens are infact needed, as it appears that the intakes also have the clam shell screens underneath the outer screens. Appreciate any help with this.