What was found
FLT#2467, BOS0CLT. (AIRCRAFT PERFORMED AN AIR TURN ABCK TO BOS) 'ENG VIB ON RIGHT ENGINE AT FL 340 AND X. 79 MACH ASSOCIATED CAUTION MSG. COMPLIED WITH. MSG EXTINGUISHED WITH THROTTLE REDUCTION; REFERENCE AMP 72-00-00-16AAA-0B5A-A. ITEM IS ON CURRENT DEFERRAL REFERENCE MDDR #482980. INTERROGATED HMU AND FOUND VIB AT TIME OF WRITE-UP AT 1.149. THIS IS CONSIDERED AN EVENT LOCATED BETWEEN 1.1 AND 1.3. PERFORMED STEPS 3, 4, 12, AND 13. NO DEFECTS WERE NOTED AND A/C IS OK FOR SERVICE. TROUBLESHOOTING WILL BE UPDATED TO REFLECT THE EVENT. THE EXCEEDANCE REPORT SHOWED 1.24 FOR 118 SECS. THE THRESHOLD STILL HOLDS PER AMP.'