If you're looking for a logic board, the closest I found was at commandmacparts that have a time capsule logic board. I haven't ordered it tested if it works in the airport extreme but it should as the time capsule uses the same 60w power supply and would have the extra connectors to connect a drive whereas the airport extreme is just in essence and empty (no drive) time capsule with no connectors on the logic board.
I get the same behaviour with my airport extreme Wifi and WAN ports work but self assigned address. I unplugged it and then did hard reset. When I configure it again using airport utility wirelessly, I connect my computer with a wire to one of the LAN ports and I get an IP address assigned from the DHCP instead of the self-assigned address I was getting before. Strange, since WAN port and Wifi work just fine. When I plug another ethernet jack connected to my unmanaged cisco 8 port switch, I once again get a self assigned address and my computer connected with ethernet is the same. It can't send packets to the airport extreme and the rest of the LAN, even if I set the IP manually, I can't ping any computer or device on my home network.
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