I have an '18 34J Windsport. I feel your pain. Make sure when the slide is extended that they hooked up the kitchen sink to the grey tank. In the same area under the oven, we had pieces and parts laying around and not connected. Flooded the entire slide before we figured that out! The rubber flaps are the "weather seal" which goes around the grey tank connection point for the kitchen sink.
I did not find one coax connector tight thruout the entire coach. Check every tv and splitter you can find. (there is a splitter in mine under the bottom drawer next to the removable panel under the oven).
The panel with the wineguard amplifier will need to be removed. There are splitters behind the panel plus the connections on the amplifier. All were loose.
Make sure you understand how the inverter functions when on the road/shorepower/generator and your autogen start. Took four inverters before the factory wiring was found out the be wrong. (This is a subject you should research on the forum(s). Lots of info that shouldn't addressed here)
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