What you need
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Use a Phillips #0 screwdriver to remove the four 21.7mm screws holding the back panel to the frame.
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There will be two black wires connecting the top mounting bracket to the reverb box at the bottom of the unit. Label the wires to prevent crossing upon re-installation, then unplug the wires from the reverb box.
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Conclusion
Once the old bracket is removed, install the new one by following the instructions in reverse.