What was found
ENG 1 AND ENG 2 ABNORMAL VIBRATION LP REACHED AMBER RANGE TWICE. (EMERGENCY DECLARED) (DIVERTED TO STL) CHECKED THE ENG1 FAN BLADE. BLADE MOVES FREELY. DEFERRED VIB DATA ANALYSIS PER FMR REF ETN-EJ-72-009 TDMI AUTHORIZATION NUMBER 027T72258. SHAKED THE BLADE FOR ENG 2. BLADE FREELY MOVES. DEFERRED DATA ANALYSIS TO BE PERFROMED ENG 2 IAW FMR REF ETN-EJ-72-009 TDMI AUTHORIZATION NUMBER 027T72257. REMOVED AND RPLACED ENGINE 1 FAN BLADES 1-28 IAW EA72-00-00-011OPS CHECKS GOOD.