Round 69 Weathershield windows, mostly casement, were installed in 2008. They were all pine wood, unclad. We had the new windows painted after installation in 2009 and again in 2016. Now we see rotting areas on a few of the window sills and brick mould (the exterior trim of the window that came with the windows. We want to replace all the window sills and brick mould with Azek PVC – on nearly all the windows whether they need it now or not (to avoid future rotting). The window mechanisms themselves seem to be OK but just need painting. We have seen any rot of the sashes, so we don’t need new windows. any recommendations?