As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR U/D FLT LK ADVISORY AND SUBSEQUENT STATES MESSAGE ON CLB OUT. RAN QRH PROCESSED NORMALLY. OPENED LEFT UPPER DECK DOOR. CLEANED SWITCHES AND CYCLED SEVERAL TIMES WITH NORMAL EICAS INDICATION IAW AMM. 52-23-00-862-001/003. OK FOR CONTINUE IN SERVICE.