I had a similar issue on my 2013 300BH (separation at the roof-to-wall seam). I had it serviced under warranty at the their facility.
Temporarily, you'll want to clean it well. I use Eternabond EC-1 Etranaclean Spray Cleaner to prep the area and Dicor beige lap sealant.
Longer term, you want to get it in under warranty and documented.. Those tears look similar to mine and they were stress tears.
2017 Ford F350 Super Duty 6.7 King Ranch Crew
2016 Crossroads Sunset Trail Grand Reserve 32BH