As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT VIBRATION GAUGE INDICATES 0 BOTH N1 AND N2. REPLACED NR 2 ENGINE ACCELEROMETER. ACP'D IDLE RUN AND N1 SHOWED 0.0 TO 0.1, N2 STAYED AT 0.0. IDLE RUN INCONCLUSIVE. REPLACED WIRE HARNESS FROM PLUG D8836P TO ACCELEROMETER D10994 DUE TO OPEN WIRE W3504-01TW-20. WD77-31-11. OPS OK ON ENG RUN.