CHICAGO (AP) — The Chicago Bears were looking to jolt their struggling defense. How does adding Jared Allen sound?The Bears agreed to a four-year contract with the five-time Pro Bowl defensive end Wednesday, replacing one accomplished pass rusher with another as they rebuild a defense that ranked among the league’s worst last season.A person with knowledge of the agreement told The Associated Press that Allen will get $15.5 million guaranteed on a deal that could be worth as much as $32 million. The person requested anonymity because the terms have not been announced.Allen’s deal can be voided down to three years and $24 million, but the first two years of his salary and a roster bonus next March are fully guaranteed.The 31-year-old Allen spent the previous six years with the NFC North rival Minnesota Vikings.