As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE STANDBY ATTITUDE INDICATION FAILED. A RESET WAS ATTEMPTED BUT DID NOT RESOLVE THE ISSUE. EMERGENCY DECLARED. LANDING UNEVENTFUL. MAINTENANCE REMOVED AND REPLACED THE INTEGRATED STANDBY FLIGHT DISPLAY IAW AMM 787-81205-A810-00. OPERATIONAL CHECK NORMAL. THE AIRCRAFT WAS GROUNDED.