[JRTJH]

The manual you posted, page 10 has the following exclusion to the basic warranty:

Any water leaks or related consequential damages that are a result of your failure to properly maintain the exterior seals as required in the Owner’s Manual.

The Owner's Manual, as you posted above details that the owner is responsible to inspect the roof every 90 days.

That would indicate (at least to me) that the factory is responsible for roof leaks during the first 90 days, and at that time, it becomes my responsibility to inspect the roof and reseal any questionable seams/joints "at least every 90 days".

Sort of like Ford saying, "The owner is responsible to change the oil every 90 days." If an oil related problem occurred at 100 days, if it was because the oil had not been changed........ YMMV