PITTSBURGH—As their defense forced five turnovers and scored twice, the Bears beat the Pittsburgh Steelers 40-23 on Sunday night to remain unbeaten.Major Wright returned an interception 38 yards for a touchdown in the second quarter, and Julius Peppers picked up Ben Roethlisberger’s fumble and raced 42 yards for a score in the fourth quarter as the Bears (3-0) held off a late rally.Roethlisberger completed 26 of 41 passes for 406 yards, and threw two touchdowns to Antonio Brown, but the Steelers fell to 0-3 for the first time since 1986 thanks to an avalanche of mistakes.Jay Cutler passed for 159 yards and threw a 17-yard touchdown strike to Earl Bennett with just under six minutes remaining to give the Bears breathing room after the Steelers trimmed a 21-point deficit to four.Henry Melton was carted off late with a knee injury.