Report "Have Jenn-Air model CCG2523. When first turning on any of the 5 gas burners, the spark igniter at the ctr rear burner continues to fire for at least 1-2 mins before eventually turning itself off. Any reasons why this occurs and what can I do to remedy? The cooktop is now about 10 yrs old. Thx for the help. If I need to replace parts as a result of general wear and tear, where is best place to go? rgds,Alex"