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Nice one OP. I had to do the same to mine a few months ago.

Supposedly there is a workshop note out for the original sensor. Apparently the sensor fails (pressure membrane perhaps?) and the gas leaks through the sensor. Hence why they superseded the sensor with a new design. I had to change the sensor, and after changing the sensor, I couldn't turn on the air con (Red AC light wouldn't light up upon button press). Re-gas and it worked fine. So failure mode seems to hold true at least for me!


As for GStyle, why are your screws different? Are you sure you're looking at the right ones? The ones you pictured can be removed if you apply a bit of upwards pressure, say with a blunt knife underneath, then unscrew as normal. Careful not to slip if using a knife! :)
 
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