What was found
ON TAKEOFF ROLL F/O LOST AIRSPEED INDICATIONS ON PFD NEVER HAD ANY CORRECT INDICATIONS ON F/O PFD. ROUND DIAL STBY AIRSPEED WORKED NORMAL. PERFORMED LEAK TEST AND LEAK TEST CHECKS OK, AS PRECAUTION REMOVED AND REPLACED NR 2 ADC AND PER MOCC REQUEST ALSO REMOVED AND REPLACED F/O'S PITOT TUBE. REF MM 34-11-15-4 AND 34-11-34-4, PERFORMED PITOT SYSTEM TEST AND ALL TEST PASSED. NO PAST HISTORY, REF MM 22-42-00-0 ALSO PERFORMED AFS LAND TEST, OK.