As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLIGHT LEVEL 380 RECEIVED THE RED PAX DOOR OPEN CAS MESSAGE. CHECKED DOOR AND PINS ALL WERE OK. DESCEND IT TO LOWER ALTITUDE PER THE CHECKLIST. CAS WENT OUT IN THE MID 20S WHEN THE CABIN PRESSURE DROPPED. CORRECTIVE ACTION; REPLACED FAULTY DOOR HANDLE MICROSWITCH ASSY. PERFORMED SEVERAL SUCCESSFUL OPS CHECKS WITH NO DEFECTS NOTED, WORK PERFORMED IAW EMB-505E AMM 52-71-20