We had an issue where our PDTs had stopped building after a patch was applied to our instance. The solution provided by support was to manually trigger a rebuild of each PDT. This required figuring out which explores were using each PDT and then running/rebuilding each of those explores.
This would have been much simpler if there was an option to rebuild each PDT directly instead of doing indirectly through an explore that relies on the PDT. This has the added bonus of allowing you to monitor everything within the PDT info panel without having to switch back and forth from explore to PDT info.