As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - UNABLE RNP ANNUNCIATED EICAS. RAN QRH CHECKLIST, MSG REMAINED TIL ENGS SHUTDOWN AT GATE. PERFORMED REALIGNNENT OF IRU'S. REALIGNMENT CHKS OK AND ALL 3 IRU'S GME LOCATION OK RAN ENG'S MSG DID NOT RETURNED, A/C OK FOR SERVICE.