I have a Jenn Air range appliance Make: Jenn air Model: CG206B. None of the four valve are working now. One by one over the last year they were getting bad. I do not have the money to replace the stove nor the valves. I have no choice but trying to taking them apart and see if they can be clean, lubricated(?) or any other service that is needed to get them back in working condition. I need to know how to take them apart, preform the service needed and any tips to put them back together. Could you give me some information about what to expect as I start taking them apart, what are the components and what chemicals to use to clean it. Do I need to use lubricant as I put them back together. Thanks a million.