Less than four years after we replaced the almost new gutters with bigger, newer gutters we found the leaders had failed again. This time we only noticed it when the electrician was updating a switch box and found it rusted out. Then he found a wet patch on the wall - not damp, wet. Outside the siding behind the downspout was saturated. We don't know how long this had been going on but it's good to catch it before it got serious. The good news was that the downspout was split from top to bottom so they replaced it, plus one other that also had a problem, for free.