Replace both surge protection units at the same time.
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Switch off AC (mains) power.
WARNING To make sure that there is no AC (mains) power available for the system, disconnect the AC (mains) cable (AC in). - Remove the protective cover.
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Press from beneath the surge protection unit and pull it out.
- Attach the replacement surge protection units.
- Reattach the protective cover with the 2 screws.
- Connect the power.