What was found
AFTER TAKEOFF, CAPT AND FIRST OFFICER AIRSPEED INDICATOR DIFFERENCE OF 50 KTS (FIFTY KNOTS). RETURN TO FIELD. INSPECTED F/O'S PITOT SYSTEM, REMOVED AND REPLACED UNION AT F/O'S PITOT PROBE. PERFORMED FULL RANGE PITOT STATIC LEAK CHECK IN ACCORDANCE WITH B727 MM 36-11-0 AND FAR PART 43 APPENDIX E, NO LEAKS NOTED. F/O'S AIRSPEED INDICATOR OPS CHECKS NORMAL IAW B727 MM 36-11-0.