As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ABOUT 12,000FT ON DESCENT GOT ECAM: DOOR LEFT AFT EMERGENCY EXIT WHICH SELF CLEARED AFTER 2 SECONDS. NO ABNORMAL PRESSURE READINGS. FLIGHT ATTENDANTS CHECKED DOOR AND ALL LOOKED NORMAL ON THEIR END AS WELL. MAINTENANCE REPLACED THE DETECTOR PROXIMITY SWITCH FOR THE 3L EMERGENCY EXIT DOOR PER AMM 52-71-13 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.