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It's normal operation for the boiler to reach the limit temp before the thermostat is satisfied. This will happen most of the time particularly when it's very cold out. The burner shuts off on limit but the pump continues to run as long as the thermostat is calling. After the burner has been off for a while the water circulating through the system will cool off and the burner will come back on.If the relief valve is discharging you probably have a failed expansion tank that should be replaced.
In light of the above what is your question?
That pressure is OK but you need to watch the pressure when the boiler gets up near limit temp. Relief valves don't just leak on their own. They leak if the pressure gets too high (over 30)or if someone flips the lever up and the valve doesn't reseat properly.Do you have more questions?