What was found
(CAN) AIRCRAFT ENCOUNTERED HI VIBRATION IN CLIMB ON NR2 ENGINE GAUGE, MFDS MESSAGE ALERT (REF JOURNEY LOG PAGE 031117). UNABLE TO MAINTAIN THRUST. THRUST WAS REDUCED BY .15 TO CLEAR ALERT. AIRCRAFT RETURNED TO BASE. MAINTENANCE TROUBLESHOT IAW AMM 71-00-00, 811-811A, STEP 101 TO 108. VIBRATION SURVEY WAS C/OUT IAW AMM 71-00-00 AND VIBRATION WAS FELT AT0.6 IPS. THE NR2 ENGINE WAS REPLACED (P/N OFF: TAY650-15/10, S/N OFF: 17679,P/N ON: TAY650-15/10,S/N ON: 17653) IAW AMM 71-00-00 (REF TASK CARD 71-00-00-400-814-C).