What was found
FOLLOW UP TO DAMAGE FOUND ON FAN BLADE PLATFORM NR 21 DURING FAN LUBE INSPECTION OF NR 1 ENGINE. GROUNDED - YES. REMOVED AND REPLACED FAN BLADE NR 21 P/N 340-001-038-0, S/N DC610218-C; BLADE NR 22 P/N 340-001-038-0, S/N DB632189-M AND ITS OPPOSITE SIDES, P/N 340-001-036-0, S/N DM183925-7, P/N 340-001-038-0, S/N DD460316-8. RESPECTIVELY ACCOMPLISHED T/C SBCFM56-7B-72-1033-1 FOR FINAL FAN BLADE POSITIONS ON THE HUB. DUE TO BLADE MAP PROCEDURE, ALL REAR SPINNER WEIGHTS RETURNED TO NOMINAL P07/P14 AND AVM POSITIONS SET TO MATCH SPINNER CONE WEIGHTS, REF B737-800 AMM 71-00-00 TEST 14B. ACCOMPLISHED FAN BLADE LUBE, REF T/C 78472010, TEST 7 VIB SURVEY, VIB LEVELS WERE 2.0 AT 96% N1. ACCOMPLISHED TEST 14B FAN TRIM BALANCE. AFTER BALANCE VIB LEVELS ARE WITHIN LIMITS, REF AMM 71-00-00-700-814-F00. AFTER BALANCE SOLUTION, BALANCE SCREWS ARE ALL 14 EXCEPT P31 & P32 ARE 12'S.