As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT CLIMBING TO FL400 AFT LT DOOR SLIDE DEPLOYED & AFT DOOR LIGHT ILLUMINATED. ACFT REMAINED PRESSURIZED. DIVERTED TO NEAREST AIRPORT. INSPECTED L2 DOOR IAW AMM 52-13-00-200-801 AFT ENTRY DOOR CHECK & 52-13-00-700-805 AFT ENTRY DOOR SYS TESTED ONE TIME AW A00 4974. DOOR OPERATIONS CHECKED SMOOTH & NORMAL. REPLACED DOOR 2L SLIDE & COVER ASSEMBLY IAW MM 25-66-01-400-803.