What was found
DURING TAKEOFF ROLL AT JFK EN ROUTE FOR PHX LOST CAPTAINS PRIMARY FLIGHT DISPLAY AND NAVIGATION DISPLAY, NAV IR 1 FAULT INDICATED, REJECTED TAKEOFF AT 95 KTS. MAINTENANCE ISSUED MEL 34-10-01, COND 2 IRS NR 1 NAV MODE INOP. WHEN AIRCRAFT ARRIVED IN PHX MAINTENANCE REMOVED AND REPLACED AIR DATA INERTIAL REFERENCE UNIT (ADIRU) NR 1 IAW T/C R2A34304, OPERATIONAL CHECK WAS GOOD. VENDOR CONFIRMED FAILURE OF ADIRU S/N 4325. UNIT WAS FOUND TO EXPERIENCE VERTICAL ACCELERATION FAILURE (FID396), PERFORMED SERVICE BULLETIN SB101-34-57, RECALIBRATED UNIT & PERFORMED FUNCTIONAL TEST IAW CMM TP1011, REV. 23.