As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5121 DURING TAXI OUT WITH BOTH ENGINES OPERATING CREW RECEIVED AN EICAS "COMP MON" MESSAGE LOOSING ALL NR 2 ENGINE INDICATIONS. WHEN INDICATIONS RETURNED 15 SECONDS LATER, ENGINE NR 2 ITT INDICATED 990C WITH ABNORMAL N1 AND N2 INDICATIONS. THE CREW NOTED A SMOKE SMELL, ENGINE WAS SHUT DOWN AND DECLARED AN EMERGENCY, AIRCRAFT RETUREND TO THE GATE. REPLACED THE RIGHT ENGINE ASSEMBLY.