CHICAGO - An Illinois appellate panel on June 25 reversed class certification in a complaint filed by firefighters who allege that certain truck and engine sirens caused them to lose their hearing (Albert Lamb, et al. v. Federal Signal Corporation, No. 1-13-1016, Ill. App., 1st Judicial Dist., 3rd Div.; 2014 Ill. App. Unpub. LEXIS 1365).