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The TVS diode is located between the antenna and a large IC on the RJ45 port side of the board. It's PCB marking is D6.
It is a LittleFuse 24V uni-directional TVS diode, with J leads (SMBJ24A). Note the location of the white bar on the diode, which marks its orientation.
Use a multimeter or ohmmeter to test that the diode has indeed shorted. A shorted diode will read less than 1 Ohm in both directions. A working diode will read significantly higher resistance in one direction relative to the other.
If the diode is not shorted, then something else is wrong, and proceeding further may or may not help fix your access point.
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