As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 VIBRATION INDICATION MISSING INTERMITTENTLY AFTER ENGINE START. GROUNDED, RAN NR 2 ENG NR 2 N2 AND NR 2 VIBE INDICATIONS WENT BLANK. VIBE MONITOR FAULTED N2 TACH LOSS NR 2 DEFAULTED 31-63160, NR 2 ENG RPM INVALID. REPLACED N2 SPEED SENSOR NR 2 ENG REF MM 77-11-02. SENSOR LEAK CKS FAULT CHKS GOOD REF MM 71-00-00. NR 2 ENG VIB INDICATION AND N2 INDICATION CK GOOD.