As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH THE CREW WAS UNABLE TO CONTROL CABIN PRESSURIZATION IN AUTO OR MANUAL MODES. EMERGENCY DECLARED. LANDING UNEVENTFUL. AIRCRAFT GROUNDED. FLIGHT MANAGEMENT AND GUIDANCE COMPUTER NR 1 FOUND FAULTED. REMOVED AND REPLACED FLIGHT MANAGEMENT AND GUIDANCE COMPUTER NR 1 AND ACCOMPLISHED PRESSURIZATION CHECKS IAW AMM 21-31-00. SYSYTEM CHECKS NORMAL.