What was found
DIVERSION/DECLARED EMERGENCY, ON TAKEOFF NR 2 ENGINE WAS 3 TO 5 SEC SLOWER TO TAKEOFF THRUST THAN NR 1 WHILE AT CRUISE FL290, 320 KIAS BEGAN FEELING A FULL AIRCRAFT VIBRATION, FA'S CALLED WITH REPORTS OF FLAMES OUT NR 2 ENGINE, NR 2 ENGINE N1 WAS ROLLED BACK TO 35 TO 40%. R&R HYDRO MECHANICAL UNIT IAW MT.