"I removed it and all screws looked okay. Should I only be looking for rusted screws?"
Did you remove the screws or just look at the heads? I'm currently fighting leaks on a Quantum, the FE's big brother. In that trim strip the screw heads can look fine but if you pull the screw out it'll be rusty from water soaked plywood. Seal the edges of the trim strip with Geocel 2300 MHRV then get the same size screws in stainless steel. Remove each old screw, squirt the hole full of Geocel and put in the new SS screw. BE CAREFUL, if the screw was really rusty the wood will be soft and easy to strip. Also check the lower edges of your "sail panels" the panel that goes from the back of the cab to the front corner of the coach body. This is a known problem area on class C's. Look under the coach and you will see the back edge joint is a leak waiting to happen. Keep an eye on you step well too, had to replace mine due to leakage.
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