What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ON TAKEOFF AND CLIMB AIRSPEED INDICATORS AIRSPEED DISAGREED; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW. FOUND FIRST OFFICER PITOT TUBE BLOCKED. REMOVED AND REPLACED FIRST OFFICER PITOT TUBE PER AMM 34-11-01-400-801. ALSO ACCOMPLISHED FLUSH OF CAPTIAN AND FIRST OFFICER PITOT SYSTEM PER AMM 34-11-00-170-802. ACCOMPLISHED LEAK CHECK OF CAPTIAN AND FIRST OFFICER PITOT SYSTEM PER AMM 34-11-00-790-807 AND 34-11-00-790-806.