As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 11000FT AMBER CABIN ALTITUDE CAS ILLUMINATED LEVELED AT 13000FT FOLLOWED BY RED CABIN ALTITUDE CAS. IMMEDIATELY DESCENDED TO 10000FT FOLLOWED SHORTLY BY 6000FT. CABIN ALTITUDE REACHED AROUND 11600FT AND QUICKLY CAME BACK DOWN DURING DESCENT. CAS MESSAGES EXTINGUISED. RAN QRH PROCEDURES AND RETURNED TO KPHX. CORRECTIVE ACTION: REPLACED CABIN PRESSURE CONTROLLER. OPS CHECK GOOD. IAW 680A AMM 21-30-15.