What was found
AFTER LEVEL OFF AT 340, SLOWLY LOST CABIN PRESSURISATION TO APPROX 10,900. BOTH OUTFLOW VALVES VERIFIED CLOSED. DESCENDED AND RETURNED TO VCP. TRANSFER TO DMI 259214 PER MEL 21-31-02A CAT C. R & R LWR FWD CARGO OVERBOARD EXHAUST VALVE IAW AMM 21-26-17-000-801-002 & AIPC 21-26-51-32A. GROUND TEST PASS, NO FAULTS NOTED. THIS CLOSES DMI 259214, PLACARDS REMOVED.