I had to wait until haul out and deck stepping to get back to work removing chain plates.
The second one is now out - this is the starboard upper - it is under this plate that the original gel coat cracking was discovered.
Here's the shots, but to save the drama - no signs of corrosion anywhere. Under the plates, same deal - no sign of any problems.
One big note worthy of remembering -
In all of these pictures I've not done so much as wipe the plates, just shake off the dust from the removal "process".
Full length (minus 1/8 inch - it's easier to remove in pieces)
Closer up to the top - this is where most plates fail
Backside of the top
Backside of the bottom.