What was found
FOR FLIGHT 2926 DURING THE PREFLIGHT INSPECTION THE FIRST OFFICERS FOUND A TRAIL OF WHITE SMOKE COMING FROM THE EXHAUST WITH A RUBBERY SMELL TO IT. THE AIRCRAFT WAS REMOVED FROM SERVICE. INSPECTED LEFT ENGINE FOR POSSIBLE SMOKE IN EXHAUST, RAN LEFT ENGINE IAW RRMM CHAP 72-00-00. THE OPERATIONAL CHECK WAS GOOD NO SMOKE NOTED IN EXHAUST ON SHUTDOWN AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.