We have replaced almost all the portlights on Nine of Cups over the years. The only ones we hadn't gotten to were the three on the transom. They were crazed to the point that they were almost translucent, and replacing them had been on the to-do list for quite a while. We were recently varnishing the trim in the aft cabin, and noticed that two of the three transom portlights had also begun leaking – nothing serious - but at least a small drip. Now seemed as good a time as any to replace them.