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Turbopilot51 -

Had the same problem. I found that the incoming shorepower line was crimping the duct work in the lower basement. There's a post with pictures out on the Mods area. About a little more than a year ago. Others have found this same problem.

Ron
(sent from my phone)

Second post, third picture: http://www.keystonerv.org/forums/showthread.php?t=2001