As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A AT CRUISE ALTITUDE THE CABIN DOOR LIGHT STARTED FLASHING AND WARNING HORN SOUNDED. DISARMED SLIDE AS IT WOULD NOT RESET. CABIN PRESSURE NORMAL. PERF OPERATIONAL CK OF EMER ESCAPE SLIDE RELEASE & RESIDUAL PRESSURE WARNING PER MM 52-73-00. OPS CK GOOD. NO DEFECTS OR PREV HISTORY NOTED. THIS CLEARS M680627.