WARSAW -- Orthopedic device supplier Symmetry Medical’s stock fell Friday after it disclosed it has begun to audit its business in Sheffield, England. Symmetry said in a statement that it is looking into transactions that “appear to have resulted in the overstatement of revenues by that unit dating back to 1999.” Symmetry acquired the Sheffield operation in 2003. Symmetry shares closed at $16.69, down $1.05, or 5.9 percent. The overstatement of revenue and income before taxes for the entire period appears to total $12 million to $16 million, the company said.