As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, NOTICED AN OVERHEAD EMERGENCY DOOR ILLUMINATED ALONG WITH A RIGHT WING SLIDE EICAS MESSAGE. STARTED DISARM OF OFF WING ESCAPE SYS FOR T/S. REMOVED AIR GRILL FOR ACCESS. REF OFF WING ESCAPE SYS RT MM. RE-INSTALLED AIR GRILLES. OPS NORMAL.