As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB PRESSURIZATION LEAK HAPPENED AT FL 280. UNABLE TO MAINTAIN CABIN PRESSURE 10,000 FT. REMOVED AND REPLACED LOWER SEAL DEPRESSOR IAW AERONAUTICAL ENGINEERS DRAWING AE2412 & DC8 SRM 51-3-0 PAGE 1, 2 & 3. PERFORMED CABIN PRESSURIZATION OPS CHECK IAW NASI SYSTEM ST466CH & MM 21-00-00, FOUND NORMAL IAW DC8 MM 21-31-0.