Its been pouring lately all over the South. This is where vents are sealed with lead, and if squirrels have eaten yours off you have a roof leak. May not seem like it because you are not seeing any ceiling stains, but its not getting to there. The water is rotting your decking, and thats not cheap to fix. Get some Critter Quitters and stop the leak before it does real damage. Homedepot.com or Amazon.