What was found
NR 2 ENGINE HIGH VIB (MORE THAN 4.0) AND MOMENTARY SURGE. PERFORMED BORESCOPE OF #2 ENGINE BOOSTER SECTION AND LPT BLADES REF. AMM 72-00-00-200-803-F00, AND AMM 72-00-00-200-808-F00. NO DEFECTS FOUND. REMOVED #2 ENG SPINNER CONES PER AMM 72-21-01, AND REMOVED #2 ENG FAN BLADES PER AMM 72-21-02. CLEANED AND INSPECTED FAN BLADES PER AMM 72-21-02. #2 ENG FAN BLADES INSTALLED ON TASK CARDS 729400000 AND T/C 720250100.ACCOMPLISHED FIM TASK 71-05 TASK 805 FOR ENG. SURGE THRU TO STEP (8). HMU TO BE REPLACED ON FOLLOWING N/R. ACCOMPLISHED FAN TRIM BALANCE REF MM 71-00-00-750-803-FOO AND VIBRATION SURVEY TEST 7 TASK 71-00-00-700-814-FOO HIGHEST READING WAS .3 UNITS AT ALL POWER SETTINGS. REMOVED ENGINE #2 HMU REF. 73-21-10-000-801-F00. PERFORMED INTERFACE INSPECTION. OK TO INSTALL NEW HMU. INSTALLED #2 HMU IAW 73-21-10. STILL REQUIRES OPS AND LEAK CHECK. OPS AND LEAK CHK'D PER AMM 71-00-00-800-811-F00. OPS CHK GOOD. NO LEAKS NOTED. RII INSPECTION OF HMU INSTALLTION COMPLETED.