How to power-down or shut-down the lan8740 ethernet PHY on the pic32 started kit? (pumperthruster)

PIC32MX795F512,lan8740,mplab 3.3,harmony 1.8 I am trying to reduce power consumption on my board as much as possible to conserve the battery life.I have my pic in sleep mode. I have all my output pins switched to 0.I have reduced my power from 500mA to ab..