As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING THRU FL250 CABIN ALTITUDE WARNING HORN CAME ON AND CABIN WAS AT 10,000FT. BOTH PACKS ON, ENGINE BLEED NR 1 AND NR 3 OPEN. NO OTHER ABNORMAL INDICATIONS (OUTFLOW VALVE CLOSED AND ALL DOES CLOSED). EMERGENY DECLARED AND NO FUEL DUMP REQUIRED.