If you found the source of the leak and you need to repair it an replace the sealant, you should remove all existing sealant, clean the area with Alcohol and reseal with the sealant made for your rig. (could be Dichor Self Leveling, Proflex, Hengs 311 or another) but others with the same model you have will chime in.
You should check all the outside sealants once a year for cracks leaks
2019 FR3 33DS Motorhome
650 Watts Solar, 400Ah LIFEPO4, 2000 Watt Inverter, 40A DC/DC Charger, SumoSprings, Roadmaster Steering Stabilizer, BlueOx Trac Bar, Truma AquaGo WH, NVIDIA Shield TV
2019 57:2020 20:2021 30 [/B]