turn on the Heat and a dehumidifer
get the interior all dried out
clean the roof thoroughly
do all the vents and seams with 'eternabond tape'
get 5 or 6 gallons of "liquid roof" and coat the complete roof, you need warm dry weather
there is something else that is water proof, and won't wash off, unless you get hit with a thunder storm right after you put it on, but i don't remember the name
be sure to check the bolts holding the A/C to roof
they should be snug, but NOT over tighten or the A/C gasket will be squished too flat and leak
these bolts are inside the RV, when you remove the inside ceiling A/C cover
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s