I would think this would be covered by the manufacturers warranty and that would be my first solution attempt.
However, I can sure understand wanting to repair it yourself. Does Jayco have an on-line sealant directory (I know Winnebago has one). That could give you a clue.
Otherwise, perhaps someone else on these forums will have a better idea!
Alfred
2005 Sightseer with Workhorse, ReadyBrute Elite towing 2003 Honda CRV
Map below shows states where we actually camped.....