We had something similar. We have a Rockwood 2608SS which has a front kitchen/rear bed, we found water on the kitchen worktop after a bad storm. I thought it had found its way down from the roof, but when I took it in to the dealer the tech found a crack around the window seal. He re-sealed it and we have been through a couple of storms since with no further leaks.
2016 Flagstaff 25FKS
2014 VW Touareg R-Line TDI
2011 Rockwood 2608SS (Gone)
2006 Infiniti QX56 (Gone)
Kenny, Annie, and Brock (The Labradoodle)