Go up in the attic. Look for signs of moisture. Remember that water flows downhill. If you see any moisture, puddles or any sign of water you have a problem. Also while you are up there, take a look for signs of light. If you see a filtration of light, then that means that there can possibly be a leak or future leak.
If you are looking for professional help or need a proper inspection, Davis Roofing and Construction is here to help. Call or contact us and we can do a formal inspection of your roof. Remember, preventive maintenance saves money in the future.