To drop the complete vent assembly you must first unplug the unit. On each side, left and right, remove 4 screws. Be sure not to loosen screws by covering the stove with blanket or large towel. Make sure you don’t let it drop have someone hold till last screws are out. Drop front down and disconnect 2 wires one is a squeeze clip type. Push unit towards rear and lift to completely detach from microwave. Now you can disassemble to install new push decor bar. Remove all filters and clean with soap and hot water. Long Phillips Head screwdrivers are a must for this repair.