I have searched Google and looked through the manual of the unit and can
find not reason for the following...
Several months ago a friend had a new Bradford White water heater installed.
Today she noticed a slow but steady stream of water(which is hot) the width
of a "drip" started from the pressure release that is plumbed through the
wall to the outside. I looked at it and manually released the pressure
using the rocker valve on top of the unit and was able to get a "gush" of
water to flow.
The drip continues albeit a bit more slowly.

What would cause this? The unit was installed by a professional plumber
referred by a home warranty.
Anything to worry about?

Thanks