What was found
DURING CLIMB & LEVEL OFF, VIBRATION SHOWED 4.0 LT & 5.0 RT ABLE TO REDUCE LT TO 1.3 BUT UNABLE TO REDUCE RT. AFTER CONSULT WITH MOCC & FLT OPS WERE INSTRUCTED TO RTB PANC, NO FUEL DUMP REQUIRED. MODERATE AIRFRAME VIBRATION ASSOCIATED WITH THE RT ENGINE VIB. CREW REPORTED ON DEBRIEF THAT ENGINE A/I WAS SELECTED TO "ON" POSITION PRIOR TO TAXI AND REMAINED ON UNTIL AFTER TOP OF CLIMB. PERFORMED THE ICE EVENT INSPECTION BORESCOPE, IAW AMM 71-00-00-6. NO LIMITING DEFECTS NOTED. COMPLIED WITH REMAINDER OF NR 1 ENGINE ICING EVENT INSPECTION REF MM 71-00-00-200-802-H01. COMPLIED WITH REMAINING PORTION OF FOD ICE INSPECTION FOR RT ENGINE REF MM 71-00-00-200--802-H01.