As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT EMERGENCY DOOR EICAS DURING CRUISE AT FL370. MESSAGE WENT OUT AT APPROX FL200. CLEANED SENSOR FOR LT EMERGENCY EXIT DOOR. PERFORMED PROXIMITY SWITCH TARGET TEST (096) AND DISPLAYED TARGET NEAR WITH LT EMERGENCY EXIT DOOR NR 3 IN CLOSED POSITION.