I have a ge jgp932 cooktop. I had one burner that would not ignite when its control knob was turned, but it would ignite when I simultaneously turned another burner control knob (all burners would then spark). Now (3 months later) that burner will not ignite at all & another is now only sparks intermittently. I was thinking its the spark module and maybe an igniter - so I was going to replace them. I've removed the unit from my counter top. I have no idea how o open up the unit. I do not want to removc the wrong screws! Could someone let me know how to properly open up the unit so I can replace the module and igniters. Many thanks!