What was found
AFTER LIFTOFF IN RDU CREW GOT A VIBRATION HIGH ENG. NR 2 INDICATION ON INNER TAPE (N2). OCCURRED WITH VIBRATION SWITCH IN BOTH NORMAL AND ALTERNATE POSITIONS. CREW REDUCED POWER TO CLIMB POWER AND VIBRATION WARNING CLEARED, BUT WAS STILL IN THE HIGH IN THE NORMAL RANGE. INDICATION STAYED WITHIN LIMITS FOR THE REMAINDER OF THE AIR RETURN. PERFORMED GROUND RUNS FOR 10 MINUTES AND FOUND VIBRATION TO BE WITHIN LIMITS. ALSO, PERFORMED VIBRATION HIGH INSPECTION. ALL FOUND TO BE WITHIN LIMITS IAW F-100 71-00-00.