If it like the rubber trim on my '02 Adventurer, just remove the rubber trim, clean and fill the gaps above and below the plastic trim snap strip with 3M windshield urethane and press the rubber trim in the next day. Do not hammer the trim in or use silicone! Leak is likely caused by the steel frame rusting below the original sealant. Poor design, many complaints on this over the years.
Ole and Anne Anderson, Highland, Michigan
'02 Adventurer 32V, Ford F-53, ours since 4/08,Goodyears, Konis, SeeLevel, CHF
'84 CJ-7 , 5.3 Chevy, 3" lift, 33's, Detroit Locker, Fiberglas tub, winch, hi-lift