As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUE TO A CABIN ALTITUDE WARNING, THE FLIGHT DESCENDED TO 10000 FT. MAINTENANCE PERFORMED BITE OF BOTH CABIN PRESSURIZATION CONTROLLERS. NR 1 CONTROLLER UNABLE TO BITE AND NR 2 CONTROLLER CHECKED OK. REPLACED THE NR 1 CONTROLLER AND PRESSURIZATION CONTROL PANEL IAW AMM. ENGINE RUN/ PRESSURIZATION CHECKED OK.