As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 3723 NOTED ILLUMINATION OF THE CABIN DOOR WARNING LIGHT DURING CRUISE. CREW COMPLIED WITH CHECKLIST AND MOVED PASSENGER'S AWAY FROM DOOR AREA, INITIATED DESCENT AND DEPRESSURIZED, LIGHT EXTINGUISHED. FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED AND LUBED THE DOOR PROXIMITY SWITCH ON THE DOOR CONTROL ARM. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE.