This is the correct way to open the Bowers & Wilkins (B&W) PX5 headphones. I found out the hard way after levering off a cover and snapping clips.
The correct way is to rotate the whole padded cover gently anti clockwise. That disengages it from the clips and it just lifts off. This example photo shows the right cover removed and the unnecessarily snapped clips on the LHS of the photo. The left side cover, which is the shown on the RHS of the photo, came off with a gentle twist.
The 4 screws to get access to the electronics are hidden underneath layer of adhesive tape like shown under the left cover (on RHS). You need to pick an edge up to peel gently off. It becomes quite easy if you use heat from a heat gun or hair dryer to soften the adhesive.
It is then easy to remove the 4 small Philips screws. You can then gently prise the module apart - the wires are short and very delicate.
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Here are the electronics in the right hand side cup.
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