From what I understand, the P39 et al, line was produced after the P323 line.
There is a genetic problem with the water pooling on the side deck around the 1st & second stanchion. Water finds it was in and deck becomes punky. I have seen all types of fixes, the best fix in my opinion is to preemptively, worst case repair the deck then install deck scuppers where the water pools. \
BobG