Report "I replaced a few parts before including waveguides. parts that i need alittle help with are ngc 3017 and ngc 3016. they seem like they go under the wave guides, from the bottom of the oven. so am i supposed to take off the side, and top covers, would i be able to get to it that way? what is the procedure of replacing these 2 parts? how hard is it to replace these parts anyway?"