23ikss owner here who has talked extensively to the dealer. Most likely it is coming from the kitchen slide since it doesn't lower down like the dinette and couch slide does. Look on the side of the kitchen slide and you will see the track that moves the slide in and out. Water can come in the channel above the zig zag track or on the zig zag track. That's what was communicated to me by the dealer and supposedly it's a known deal on the ikss because of the kitchen slide.
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2014 Shamrock 23IKSS
2007 Chevy Tahoe 5.3L V8 with 3.73 rear end, Primus IQ Break Controller, and Equalizer Hitch
DW (Not allowed to say)
DD (3 year)
DS (6 months)