As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SERVICE DOOR DOESN'T SHOW ARMED ON MFD WHEN F/A ARMS DOOR FOR DEPARTURE. DOOR MUST BE OPENED THEN CLOSED IN ORDER TO INDCATE CLOSED (ARMED) ON MFD STATUS PAGE. PERFORMED SI527002, FOUND A RETAINER RING MISSING FROM R1 VENT FLAP INDICATION GUIDE LOCK IAW EMB 170 CMM 52-41-22. INSTALLED NEW CLIP, OPS CHECK GOOD.