What was found
AIRCRAFT 384 ATB, RETURNED TO DEPARTURE DUE TO NAV ADR 2 FAULT. ACCOMPLISHED TSM 34-10-00-810-995, NO FAULTS NOTED. ACCOMPLISHED AFS BITE AND LAND 3 CAPABILITY TEST, 22-96-00 AND 22-97-00 NO FAULTS NOTED. F/O PITOT PROBE AND PITOT LINE WERE CHECKED, INSPECTED AND FLUSHED, ALL CHECKED GOOD AND NO DEBRIS FOUND. PERFORMED RESET OF THE 3 FCPC PUSHBUTTON SWITCHES ON THE OVERHEAD PANEL, WITH 3 HYDRAULIC SYSTEMS DEPRESSURIZED, ORIGINAL FAULTS CLEARED. ACCOMPLISHED AIRSPEED INDICATION, ALL CHECK NORMAL.