As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CABIN DOOR SLIDE 4L DOES NOT INDICATE ARMED WHEN AIRBORNE. AMBER SLIDE LIGHT FLASHES ON FLIGHT ATTENDANT PANEL. MAINTENANCE ADJUSTED L4 DOOR SLIDE ARMING PROXIMITY SENSOR 7WN1 PER AMM 52-71-00. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.