What was found
7000' ECAM AT BLW 100' COMPLY WITH ECAM ACTIONS. UNABLE TO RESTORE, SYS WENT TO MANUAL MODE & DID NOT WORK, PRESS WENT UP, CABIN ALT 5800'. TROUBLESHOOTING REVEALED A PULLED & COLLARED CB Y17, AVIONICS VENT MONITORING, & THE EXTRACT AIR VLV SWITCH IN THE OFF POSITION. MEL 21-26-10A DOES NOT INSTRUCT TO DO SO. ACFT PLACED IN CONFIGURATION FOR MEL 21-26-10A M PROCEDURES. SKIN AIR INLET VLV DEACTIVATED & CHECK OF VENTILATION SYS OPERATIONS CHECKED GOOD. COMPLIED WITH OPERATIONS TEST OF PRESS CONTROL & MONITORING IAW AMM 21-31-00-710-002A. OPERATIONS GOOD.