What was found
AFTER TO #2 ENGINE LPVIB WENT TO 4.0. CLIMBED TO 21K, RAN ENGINE VIB CKLST. VIB WOULD GO BELOW 4.0 BUT WOULD RETURN TO 4.0 WHEN THRUST LEVER WAS ADVANCED. ON DESENT ENGINE VIB WOULD BE BETWEEN 3.0 & 1.0 DEPENDING ON TLA. DIVERTED. LANDING UNEVENTFUL. REMOVED FROM SERVICE. C/W LMM 72-21-00 SP 097 PAR 5A-G 1-5I. PAR 5E &5F N/A. (#16 BUMPER WAS FOUND OUT OF CORRECT POSITION). CONT WITH N1 VIBE TROUBLESHOOTING, REF LMM 72-21-00 SP 097 STEPS 5G.5(J) THRU 5M. FOUND 5 BLADES (3,12,17,18,26) W/ P02 BUMPERS FAILED TORQUE CHECKS. REPLACED W/ P01, ALL BLADES SET TO P01 BUMPERS. BLADES PASS TORQUE CHECKS AND ROCKER TESTS. HIGHEST N1 VIBE LEVELS ARE 1.0. RII C/W FOR AFT & FWD SPINNER INSTALLATION ONLY. AIRCRAFT RETURNED TO SERVICE.