Hi again Minnie22R,
I can see from your photos that you do not have the nose cap. I wonder if a nose cap could be retrofitted to your 22R?
If it were me, I would go over the entire roof and every leading seem with a fine-tooth comb, and any area that looks suspicious, I would clean with rubbing alcohol and re-seal with the Winnebago-specified sealant for that area. Once the sealant is cured, I would set-up a lawn sprinkler on the roof and check for leaks inside. Then, I would spray the front area with a hose and see if I could make it leak that way.
I guess you will need to order replacement interior panels; not sure.
2019 Minnie Winnie 22M on an E-450 frame