What was found
ENG 2 N1 VIBES HIGH, CHECKED ALL CHIP DETECTORS ON NR 2 ENG, NO DEBRIS FOUND. POS 2 FAN BLADE TAP TEST REQ'D DUE TO HIGH N1 VIBE. PER T-S NEED TAP TEST PER AMM. ACP'D TAP TEST PER MM. FAILED ONE EA MARKED BLADE WITH 2979 DB PER SEC. NEED TO REPLACE N1 VIBRATION TRANSDUCER, PCN 482-0130. ACP'D TSM TASK AND FOUND DISBONDED FAN BLADE. CALLOUT NOT REQ'D BUT SEE AMIS FOR REPLACED XDUCER AND BORO RESULTS. ACP'D FIM TASK 77-30-00-810-827 AND FOUND FAN BLADE NR 7 DISBONDED. REVIEWED AMIS AND ECM DATA & FOUND PAST TRIM BALANCE CORRECTED IMBALANCE BUT ON 28MAR ON TKO FROM TPA SAW LARGE SHIFT IN N1 VIBE AND SUBSEQUENT INCREASE IN MILS ON EACH TKO REPORT. BLADE NR 7 FAILED TAP TEST AND WAS REPLACED.