As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LOST PRESSURIZATION AT 6500 FT IN DESCENT TO ILN, BOTH PACKS ON. CHECKED TAIL COMPARTMENT FOR LOOSE AND BLOWN DUCTS. NO DEFECTS FOUND. PERFORMED ADJ/TEST OF CABIN PRESSURE CONTROL WITH PNEUMATIC SOURCE IAW DC9 MM 21-32-00-2-0101. SYSTEM OPERATES NORMAL.