The caulk on the roof seams can come lose fairly easily. This is especially true of a dealer sends there inexperienced wash kid out with a pressure washer to clean it up. ( The manual clearly states not to use a pressure washer). To find the lose sections of caulk, take a hair dryer on high fan cool temp and blow directly at the caulk joints at a 45 degree angle to the roof. Watch the caulk carefully, loose sections will flutter. Carefully look under the caulk. If it is dirty, water has gotten under a loose section. Remove tha bad section, thoroughly clean with alcohol and when dry, I use 5200 marine sealant. It is a little harder to use, but will never come lose. Check all the window seams as well as the seams around the marker lights. Because of all the leaks you have, I would suspect the power washer.
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