Defrost Cycle noy Functioning

Found Board location and replacement instructions on Appliance Doctor website. Price there was actually 3 $30.00 cheaper.Had to remove light cover to access slots to insert a flat blade screwdriver which you use to depress tabs to unlock control board housing. It then swings down so you can unplug wiring harness's and remove and replace control board. Too early to tell if defrost is working yet.