As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL370 AUTO PRESSURIZATION FAILED IN AUTO MODE. CAPTAIN DEPLOYED MASK AND SWITCHED TO MANUAL MODE AND RECOVERED CABIN ALTITUDE. COULD NOT CONTROL CABIN ALT PRESSURE IN MANUAL. CHANGED PRESSURE CONTROLLER AND FOUND LOOSE DUCT IN CABIN UNDER FLOOR AREA THAT WAS SEVERED AS WELL. (K)