As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG 2 LP AND HP VIB IN AMBER RANGE (5.9). COULDN'T BE CONTROLLED BY CHECKLIST PROCEDURES. ENG 2 FIRE DET FAIL. ENG 2 CONTROL FAULT. ENG 2 NO DISPATCH. EMERGENCY DECLARED. RETURN TO FIELD. REPLACED #2 ENGINE IAW ENVOY EMB-170 W/C 71-00-01-400-801.