As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION SYSTEM WILL NOT HOLD CABIN PRESSURE BELOW 10,000 UNLESS BOTH FLOW SWITCHES ARE IN THE MID POSITION OR HIGHER. CABIN ALTITUDE HORN ACTUATED AND THE EMERGENCY PROCEDURES WERE ACCOMPLISHED.INSPECTED AND CLEANED MAIN DOOR SEAL AND INFLATION HOLES. CHECKED GOOD AT THIS TIME IAW DC-8 M/M 52-36-8.