Look, you NEED to READ your policy.
Typically, MAINTENANCE issues are the homeowner's responsibility. So it doesn't surprise me at all, to know that slow leaks over time, are not going to be covered.
And if YOU can't be bothered to read your own policy, why do you think someone HERE will do it? Silly, because they have LOTS and LOTS of different KINDS of policies, and no one here could possibly know which one YOU have.