What was found
ON TAKE OFF AND CLIMB, F/A AND PAX REPORTED LOUD VIBRATION FROM LT ENGINE AND ODOR OF OIL & SMOKE IN CABIN. SOUND REDUCED WITH POWER 70 N1. ALL ENGINE INDICATIONS NORMAL VIBRATION INCREASED DURING DESCENT WITH POWER AT IDLE. ALL C/P INDICATIONS NORMAL. NORMAL APP LDG. VIBRATION METER INCREASED TO 1.0 ON DESCENT THEN REDUCED TO .4. TROUBLESHOOTING REVEALED AUDIBLE AND TACTILE VIBRATION FROM NR 1 ENGINE MOST PRONOUNCED AT 91.3 AND 80. ENGINE VIBRATION 1.1 UNITS AT 55-57. REMOVED NR 1 ENGINE IAW T/C 78471000, INSTALLED NR 1 ENGINE REF T/C 78471001.