As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 DOOR RED LIGHT FLASHED DURING FLIGHT, AS REPORTED BY JUMPSEATER. NO PRESSURIZATION O2 COCKPIT INDICATIONS NOTED. PERFORMED OPS CHECK OF DOOR WARNING SYSTEM IAW AMM 52-73-11-04-08. NO FAULTS NOTED. NO 90 HISTORY. ACFT OF FOR SERVICE.