As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER DOOR WARNING AT 500FT ON FINAL. NR 1 FLIGHT ATTENDANT REPORTS RED FLAG UNLOCKED, APPEARED WHILE AIRBORNE. PRIOR LANDING FLIGHT ATTENDANT NR 2 OBSERVED DOOR HANDLE UP THEN DOWN, APPROXIMATELY 2" AFTER LANDING. ADJUSTED LATCH MECHANISM INNER HANDLE FORCE IAW WITH AMM 52-11-02. OPS CHECKED GOOD. FOUND OUTER HANDLE FLAP STICKING. CLEANED DEBRIS FROM SPRINGS.