ONLY FOLLOW THESE INSTRUCTIONS if E1 turbo is below 820 Hz, pressure in E1 is above 2.5E-1 mbar and experts (Nikos, Andreas) cannot be reached.

Go to the red cabinet under the stairs.

Open rightmost door. See first photo. Do not press the button on the handle or the door will lock!

Turn down pressure regulator indicated in second photo by approximately 1 degree. Read regulator to know which way to turn to decrease. No immediate change should be obvious on the pressure regulator.

Check E1 pressure for 5 minutes. If no effect, turn pressure down again until an effect appears.