As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON SYS 2 VERY LARGE PRESSURE BUMPS IN CLIMB AND CRUISE. WITH PSID 7.6 OR HIGHER, OUTFLOW VALVE CLOSES & EXTRACT VALVE OPENS (AMBER). PRESSURE IN CABIN FLUCTUATES FROM +1000 TO-1000. THE FLUCTUATIONS ARE RANDOM AND THRUST SETTINGS SEEM TO HAVE NO EFFECT ON PRESSURE BUMPS. REMOVED AND REPLACED FLIGHT MANAGEMENT COMPUTER (FMGC) NO.1.