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How exactly do you disconnect the filling loop (Filling Loop Straight) ?

The internal leak looks to be coming from the pressure relief valve pipe that goes through the wall to the outside. The filling loop is currently connected.

Do you mean I should bleed the radiator? Would that stop the leak from the Vaillant boiler and would the pressure return to between 1 and 1.5 bar?

I have a Vaillant TURBOmax VUW 242/1 e, 282/1 E and white hand on the lower scale of the pressure and temperature gauge is at 2.2 bar. According to the manual, it should be between 1 and 1.5 bar. I can see that there is a slow leak coming from one to the copper pipes and also a slow leak...