Parasound A21+ layout question

hi, question about layout arose on local forums for said amplifier, i think it could have some hum on output from proximity of power wires and some form of low level signaling and drive circuitry, i have found measurments on web and it seems that this amp has slight bump at 50/100Hz thd+n but i am seeking if someone has noise measurment and if someone can confirm does this amp have any unwanted 50/100Hz on output due to factors mentioned here or is it thd.

thank you. pictures attached.
 

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