I purchased a burner and a oven orifice replacement kit from Appliance Parts Pros. I downloaded an installation manual from Whirlpool and followed the instructions. It was pretty easy. The front burner orifices could be replaced by just taking off the burner cover. The back ones required removing the burner diffuser. You will need to reattach the back burner bottom assembies after you remove the diffuser before you unscrew the orifice or it might bend the burner piping causing it to not line up with the mounting holes. The instructions recommended putting some masking tape over the nut driver end to provide a interference fit for the orifices so they wouldn't fall out. This was very helpful.