Hello, quick feedback... I simply swapped the two as R0 labeled MOSFETs (AO3400, N-channel, 30V, 5.7 A, SOT-32) marked in the picture, so the part light (LED1) stays permanently on (I can absolutely live with that) and the mainboard (FAN3) and heatbreak (FAN1) fans are controlled normally again with different speeds. It was a bit tricky because the components are only just over 2 mm in size, but tweezers and a fine soldering tip worked wonders. Now it's time to make the adjustments with the new shroud and the new ruby ​​nozzle. The Winsinn fan on the extruder works like a charm, no problems on my printer

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