Diode is not enough. It needs 100Ohm resistor in series.
That will be a hack job if you don't put the right value resistor in series with the diode. You will need a scope to properly set this mod up. Different values for different power settings and proper mic gain setting or it will be a splatter box.Install 1n914 or 1n4148 diode, cathode to the center leg of AM regulator trace as pictured. Make sure you don't accidentally short the leads on the cap your soldering the anode end of the diode to.
Enter the service menu to set your power levelsView attachment 66650View attachment 66651