If the expansion tank no longer has the correct air pressure (60psi) it will cause the pressure valve to leak. You should check the air pressure on the expansion tank. If the air pressure is less than 60psi you will need to add air to the expansion tank to bring it to 60psi. The fitting on the expansion tank is similar to a valve stem on a car tire. You can get a gage with that type of fitting at Lowes or Home Depot so you can check the air pressure in the expansion tank. Your leak may be solved by just adding air to the expansion tank.
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