One burner didn't work, others were failing

I simply followed the instructions on the PartSelect website. Since the range is 20 years old, I replaced all four terminal blocks. I used needle nose pliers to carefully nurse the old terminals off the burner controls, and used fine sandpaper to burnish the male contacts on the burner controls. Since the failed terminal block wire had overheated, I burnished the burner contacts that slip into the terminal blocks to eliminate any resistance that could cause overheating. So far, all burners are working great!