As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIENCED A LEFT OVERWING EXIT SLIDE NOT ARMED MESSAGE IN FLIGHT. ON LANDING, MX FOUND THE LT FWD OVERWING EXIT DOOR EMERGENCY SLIDE ARMING PIN IN THE DISARM POSITION. MX ARMED THE OVERWING SLIDE IAW AMM 52-21-11, NO FAULTS SINCE THEN. REPLACED THE LT FWD OVERWING EXIT DOOR SEAL ON THE PREVIOUS FLIGHT.