As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN DOOR SEAL MESSAGE ILLUMINATED 1 HOUR AND 20 MINUTES INTO FLIGHT AT FL430, SHORTLY THERE AFTER IT COMMENCED TO SQUEALING VERY LOUD. SQUEALING QUIT AROUND FL180 DURING DESCENT. EMERGENCY DECLARED. COULD NOT DUPLICATE "CABIN DOOR SEAL" CAS MESSAGE. PERFORMED FUNCTIONAL AND OPERATIONALLY CHECKS GOOD IAW CE750 M/M 52-10-04.