As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - INFLIGHT MIA-SXM. CREW REPORTED AFT ENTRY AND AFT SERVICE DOOR LIGHT ILLUMINATED AND THE INTTERMITTENT CABIN ALT WARNING HORN ALSO SOUNDED. EMERGENCY DECLARED FLIGHT DIVERTED SJU LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED PROXIMITY SENSOR ELECTRONICS UNIT. SYSTEM GROUND CHECK NORMAL OPERATION.