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How do I DECREASE the water pressure in a TurboMAX 828/2 E?

I have overfilled the boiler (TurboMAX 828/2 E) and now need to LOWER the pressure. Have no idea how to do this. Any help gratefully received...
Josh, February 2012
Drain out from drain point mostly out side, or from air vent on radiator

ltd, February 2012