After an overly agressive cleaning the burners would not spark. I decided to replace the spark module, ignitor switch assy. and 4 Orifice holders with new electrodes. While dismantling I found one wire on the ignitor switch assy was burned off, replaced everything one wire at a time on the spark module and ISA. Turned on the front left burner and both the left front and rear burners began sparking, tried the rear left, both front and rear sparked, tried the front right and the left side both sparked, same thing when I tried the right rear. Methodically switched wires on the spark module, two burners would always spark together, two would not spark. Any ideas?