What was found
FLT 4469 - DURING CRUISE FROM SLC-SJC, AT APPROXIMATELY 32,000 FEET, THE VIBRATION METER WENT INTO THE YELLOW AT 1.9. THE QRH WAS COMPLIED WITH AND THE ENGINE WAS BROUGHT BACK INTO THE GREEN. THE TOWER DECLARED AN EMERGENCY, AND THE AIRCRAFT RETURNED TO SLC, LANDING SAFELY. MAINTENANCE PERFORMED ENGINE RUNS THROUGH ALL POWER SETTINGS. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)