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I agree with labman, the installer should produce the answer.
I have over a half-acre that is grass. My similar problem was not pressure related either. The problem was volume. The answer for me was...

Sierra1 is most likely right, you probably have rot. Here is a possible alternative. If this look is not offensive it will work.
Go down to Home Depot (or equivalent) and pick up the galvanized...

You may want to consider installing a whole-house evacuator fan. They are not very expensive, and can be installed by a handyman rather than an expensive contractor.
What this will do for you......

Hello, I have a detached garage about 150' from the main. I want to install a sub-panel in it. What kind of wire do I use to run it the same way it comes into the house (overhead). Does Home Depot...