B&W PX7 Noise and cutoffs at the left headphone

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first we disconnect the ear cups with a gentle pull

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Now we remove the speakers cover

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Now we remove the three screws marked with a red circle with a PH1

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If you did step 4 before step 3, you will have noticed that the rear cover is held in place at the red circle. And you will have removed the glued on metal cover in this process.

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In the red circle you now remove the PH00 screw

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After removing the outside cover and the last screw there you can push the speaker up carefully and reach the electronics.

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After I had removed all the cables and reconnected everything I noticed some unisolated wires (red circle)

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after some creative use of insulation tape over the soldering points in the vicinity an unintended short circuit seems to be avoided.

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Now "just" do all the previous steps in the reverse order (not the tape though) to put everything back together.