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Herb,
there were plenty of those lead sheets in the floor of my plane ( '77 T337G ) and there was corrosion under most of the ones near the door. My observation was if they came up relatively easily, there was corrosion underneath. If they were really stuck down well, there wasn't much if any corrosion, like the picture you showed with the shiny aluminum underneath. My guess is that on those sheets, there was glue between the lead and the aluminum preventing contact, water intrusion and thus, dissimilar metal corrosion. The right thing to do is remove all of them just to be sure, but I think a reasonable argument could be made based on the above observation to be selective. I will tell you I left some behind that were stuck well and were in hard places to get to.
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