As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AMBER "CABIN ALTITUDE" CAS MESSAGE ILLUMINATED IN FLIGHT APPROX 10 MINUTES INTO LEVEL FLIGHT AT FL 400. CABIN BEGAN TO DEPRESSURIZE. IMMEDIATELY DESCENDED TO 10,000 FT AND LANDED. R & R THE MANUAL CONTROL VALVE IAW MM 21-30-00. OPS CHECKED GOOD.