As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 13 MAY 2024, RECEIVED ATLAS REPORT THAT N475MC CREW REPORTED VIA SATCOM DUAL OUTFLOW VALVE FAILURE. FOUND CABIN PRESS CONT RH ICU C/B PULLED AND COLLARED ON P6 PANEL (CABIN PRESS ONTR LH ICU C/B CLOSED). LH ICU C/B SHOULD HAVE BEEN PULLED AND COLLARED IAW THE LH OUTFLOW VALVE DMI 208466 ON 10MAY24 AT NKG STATION. RESTORED RH ICU C/B AND TESTED RH OUTFLOW VALVE OPERATION, OPERATIONAL CHECK NORMAL IAW AMM 21-31-00/501. DMI 208466 CURRENTLY OPEN