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DP83TC814S-Q1: DP83TC814S-Q1 Power Spectral Density test failed in test mode5

Part Number: DP83TC814S-Q1

like the above image showed, my 814s test failed in test mode 5, Is there any advices or some register configurations  help to improve the performance?

my configure for test mode 5 just follow datasheet like below:

Test mode 5 is enabled by setting bits[15:13] = 0b101 in MMD1_PMA_TEST_MODE_CTRL Register (0x1836).