As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESS. FAIL DURING CLIMB OUT-C/A-FLIGHT CREW PLACARDED PER MEL2122 AUTH010305DMC MOC 135181 M PROC C/W. FOUND FLAP TYPE GROUND CONNECTION VALVE MISSING. REMOVED AND REPLACED FLAP VALVE IAW AMM 21-22-04. PERFORMED BOROSCOPE INSPECTION, FOUND FLAP VALVE WITHIN DUCTING. PERFORMED PRESSURIZATION CONTROL SYS TEST IAW AMM 21-31-00. OPC GOOD. MEL 21-22 RESTORED M PROCEDURES REVERSED