I had the same problem and decided the problem was they were two close to each other. I forced a shim between the two boards to push them away from each other. Then used a lever to pull one up. After I had them up a cleaned all the joints really well and now they come up pretty easy. If you have a dehumidifier or AC, run it for a week before you try to reduce the swelling of the wood. This will make your life much easier.
Pacific Seacraft 34 #142
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