As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER BLOCK OUT C IRS FAULT EICAS MESSAGE AND FAULT LIGHT ON OVERHEAD. AICRAFT RETURNED TO BLOCK AND WAS GROUNDED BY MAINTENANCE. MAINTENANCE DEFERRED C IRS PER MEL 34-21-1C. ALL MX PROCEDURES C/W. PLACARDS INSTALLED. AIRCRAFT RETURNED TO SERVICE.