Welcome,
I too would post this in the appropriate forum, and be sure to indicate which specific model you have. Some models may have a hwt or plumbing very near the dinette, while others will not and that will determine the areas to troubleshoot.
Since there is a window nearby, that is the first thing I would look at. Give the weather stripping and any caulking/sealants around the window unit a very good inspection. Since you say it was worse after 'opening up' I assume you mean after long sit with the water system drained, so that would lead me to check for window or roof leaks first.
You can also look for a local shop that does SealTech testing if the source isn't obvious. This involves pressurizing the RV and then spraying down with a soapy solution. Bubbles appear where air is leaking out (and water is getting in). Worth it to find obscure leaks. The Sealtech website has a locator to find a facility near you.
Good luck!
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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