What was found
DSM - FLT 1009 - AFTER T/O ORD, DURING CLIMB-OUT, LOST SECONDARY PRESS CONTROLLER. SELECTED PRIMARY CONTROLLER AND REGAINED PRESS CONTROL. SUBSEQUENTLY LOST PRIMARY PRESS CONTROLLER IN CRUISE AT FL 350. PAX 02 CANISTERS ACT, INITIATED EMERG DESCENT AND A/C DIVERTED TO DSM AND LANDED W/O INCIDENT. O2 CANISTERS AT FWD DOOR F/A POSITION AND AFT GALLEY F/A POSITION FAILED TO EJECT. ALL OTHER CANISTERS EJECTED NORM. A/C MX FERRY DSM/ORD. REPLACED NR 1 AND NR 2 PRESS CONTROLLERS. ALSO, REPLACED CABIN AIR OUTFLOW VLV MOTOR. ACCOMP GROUND ENG AND PRESS CHECK W/NO DEFECTS FOUND. SYS GROUND CHECKED NORMAL OP. REPLACED ALL 02 CANISTERS AND RESTOWED MASKS. REPLACED 02 HOUSING ASSY AT AFT GALLEY F/A POSITION AN