The Rangers’ search for bullpen help isn’t just widening to minor league camp. It stretches all the way to Florida, too. The club has reportedly sent senior scout Don Welke, a special assistant to general manager Jon Daniels, to look at the New York Yankees’ Joba Chamberlain and, according to a major league source, to get a feel for the possible matchups with the Boston Red Sox, who are believed to have relief depth. The Yankees and Red Sox both had representatives at the Rangers-Oakland exhibition Thursday. This comes on the heels of the Rangers promoting minor league right-handers Lisalverto Bonilla and Ben Rowen to major league camp to take a longer look at them and after signing Derek Lowe as a potential middle- or long-reliever. Lowe makes his first appearance Friday and will pitch two innings against San Francisco. The need for right-handed relief has become more glaring as three pitchers who were expected to figure into the mix – Josh Lindblom, Tanner Scheppers and Evan Meek – have all struggled. The trio has allowed a composite .387 batting average (29-for-75) this spring. “The bullpen is an area we’d like to improve,” Daniels said. “We just need to give it a chance to improve internally first.