I have a friend with a 5 year old roof who had panels installed and now has leaks two years later. He checked the visible portion of the roof and could not find anything. He thinks it could be under the panels but can't see under them. A roofer told him the same. He's still trying to figure out what to do. Plus my story about my work place solar system being installed by a fly-by-night which damaged the roof causing leaks. YMMV.