What was found
INBOUND TO ATL LOST CABIN PRESSURIZATION AT 14,000 FT, PASSENGER OXYGEN MASKS DEPLOYED. BOTH AIR CONDITIONING PACKS QUIT AT THE SAME TIME. BOTH PACKS WERE RESTARTED BUT THEY QUIT AGAIN. FOUND RIGHT AIR CYCLE MACHINE DISCHARGE DUCT BLOWN. RE-SECURED BLOWN DUCT AND CHANGED CLAMPS. OPERATED BOTH PACKS AND PRESSURIZED AIRCRAFT. NO LEAKS OR DEFECTS NOTED IN AIR-CONDITIONING SYSTEM. ALL WORK DONE IAW DC9 MM 21-50.