As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3904, LGA TO ROC HAD TO LOWER ALTITUDE AND DEPRESSURIZE DUE TO PASSENGER AIRSTAIR DOOR WARNING LIGHT ILLUMINATING DURING CRUISE. AIRCRAFT LANDED UNEVENTFULLY. MAINTENANCE FOUND THE OVERCENTER PROXIMITY SWITCH OUT OF ADJUSTMENT. SENSOR WAS ADJUSTED PER MAINTENANCE MANUAL AND DOOR WAS OPERATIONAL CHECKED. ALL CHECK GOOD AND AIRCRAFT RETURNED TO SERVICE.