As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THE [CABIN DOOR] CAWS CAPTION ILLUMINATED, ACCOMPANIED BY THE MASTER WARNING AND AURAL "WARNING, PASSENGER DOOR" CALLOUT WAS ANNUNCIATED AT APPROXIMATELY FL200 AND 4.5 CABIN PSID. THE WARNING INDICATION REMAINED UNTIL BELOW 10,000 FT MSL AND 3.0 CABIN PSID, AT WHICH POINT THE INDICATION RETURNED TO NORMAL STATUS. OPEN