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Make sure to test the new diode before installing it. A working TVS diode will show much higher resistance in one direction relative to the other.

Install the new diode.

Note the marking on the diode which indicates its orientation. The bar must be pointing towards the antenna.

Apply flux to the pads, then add a thin layer of solder. If solder does not stick to the pads, you can add it to the underside of the diode pins instead.

Hold the new diode in place using tweezers. While applying downward force, apply heat to one pin near the solder until the solder melts and makes a connection. Repeat with the other lead.

Verify that the connections are good. There should be continuity between: one pin of D6 and a pin in VR3, and; the other pin of D6 and D7.

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