As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT MID 20K IN ALTITUDE, NR 1 ENGINE HP VIBRATION GAUGE JUMPED INTO THE AMBER, ABOUT .33 -.5 UP. VIBRATION CHANGED WITH REDUCTION INCREASED WITH ADVANCEMENT. SEEMED WORSE BETWEEN FL 250 AND FL 320. R & R NR 1 ENGINE IAW 71-000-00. OPS & LEAK CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.