I had the same thing happened and I seem to have fixed it and its been going good for over 2 years
I used Permatex 82194 Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker.
Pulled the rubber seal out, filled the channel to the max with the RTV and let it cure for a week (RV in Storage).
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 30:2022 46:2023 16