As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN AUTO PRESSURIZATION FAULT. AN EMERGENCY WAS DECLARED. FLIGHT DIVERTED & LANDED WITHOUT INCIDENT. ACFT GROUNDED. R & R NR 1 CABIN PRESS CONTROLLER. WORK ACCOMPLISHED IAW MM 21-31-02, AMM 32-09-02, SWPM 20-90-11 & SWPM 20-81-26. TESTED SYS AS REQUIRED, ALL CHECKED OK.