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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Almost done!
Once the old bracket is removed, install the new one by following the instructions in reverse.
Conclusion
Once the old bracket is removed, install the new one by following the instructions in reverse.