B try change FB2303 on top layer, if did not help, go to next bullet
B try change resistor U2304 on top layer, if did not help, go to next bullet
B try change CPU chip U100, if did not help, go to next bullet
B try change connectors J2101, J2201 on top layer under SFP cage, if did not help, go to
next bullet
B try change U2304, if did not help, go to next bullet
B try change L2301, if did not help, board unrepairable.
20 Problems with ether ports
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