I have had the Mendota Chelsea for 5 years, love it, but recently my rear burner would not light. The manual advised that there is a 9V battery behind the control panel that activates the rear burner and Mendota recommends changing annually (I didn't recall this when initially reading the manual after installation). Problem is, Mendota gives no guidance as to how to remove the cover for the control panel or otherwise access this battery after installation. I could not see an easy DYI solution for me, and my only option would be to hire a professional to change a 9V battery (which sounds crazy). If I have to hire a pro, so be it, I'll likely get the whole unit tuned up. Before I do so, if anyone has any experience with this, I would appreciate any guidance you can provide.