What was found
FIRST OFFICER AIRSPEED FLUCTUATING UP AND DOWN AT GATE F/O AIRSPEED INDICATOR CHECKED FLUCTUATING. NOT RESETTABLE. MEL3413X APPLIED. TOMC PENDING ADD EMP:V946366 MEL 3413X APPROVED DEFERED F/O AIRSPEED IND INOP PER MEL 34-13X F/O MACH AIRSPEED INDICATOR REPLACED IAW AMM 34-13-02-004-021 REV.143 OPERATIONAL TEST IAW AMM 34-12-00-715-001 REV.143 PERFORMED, TEST PASSED. MEL CLEARED AND A/C OK FOR SERVICE.ROTABLE PARTS CHANGE WAS INDICATED - TT # 1682626 SN OFF 6463 INDICATOR, MACH OFF 75-3111-9-0001 6463 ON 75-3111-9-0001 4304 NEW SRVICEABLE PART.