Welcome to the forum: wlcm:
Sorry it has to be under these circumstances. If the slide is leaking when itís retracted, then odds are one or more seal is failing/failed.
Extend the slide and give all the seals a very through, close up inspection. Pay attention to the top corners, and what ever side faces the weather.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.