What was found
ON TAKEOFF OUT OF SJC EN ROUTE FOR PHX AT 75 FT WITH GEAR RAISED, RECEIVED GEAR NOT DOWN WARNING & BELL & AIRCRAFT WAS NOT PRESSURIZING, ALSO HAD NO FLIGHT DIRECTOR, AUTOPILOT OR AUTOTHRUST. AT 400 FT RECYCLED LANDING GEAR & ALL SYSTEMS RETURNED TO NORMAL, ACARS NEVER LOGGED OFF TIME. MAINTENANCE REMOVED AND REPLACED NR 1 & 2 FLIGHT WARNING COMPUTERS IAW T/C R2A31303, OPERATIONAL CHECK WAS GOOD. VENDOR FUNCTIONAL TEST OF FLIGHT WARNING COMPUTERS S/N'S 317 & 1262 WERE BOTH NO FAULT FOUND. BOTH UNITS WERE TEST AND RETURNED TO SERVICE IAW CMM 31-53-34, REV 14.