(Champaign, IL)  --  Two Beaverton Jimmy John's restaurants are among the more than 200 locations nationwide affected by a potential security breach involving customers' debit and credit cards.  The sandwich chain says the potential breach took place after an intruder stole log-in credentials from the company's vendor and used them to remotely access systems between June 16th and September 5th.  The Oregon Jimmy John's restaurants that were affected include one on Southwest Cedar Hills Boulevard and one on Northwest Evergreen Parkway, both in Beaverton.