What was found
FLT 754, CUN-JFK, DURING TAKEOFF AT 500FT NR 2 ENG VIBRATION FOLLOWED BY IDG 2 LOW OIL N1 VIBRATION SHOWED 3.6 AFTER IDG DISCONNECTED, AIR TURNBACK TO CUN. REMOVED AND REPLACED NR 2 IDG IAW AMM 24-21-51, OPS AND LEAK CHECK GOOD. N1 VIBRATION WITHIN LIMITS IAW AMM 71-000-00-02, A/C OK FOR SERVICE.