What was found
ATL/MEM - FLT 512 - CABIN PRESSURE LOST AT FL 240. CABIN ALTITUDE INCREASED TO OVER 15,000 FEET DURING EMERGENCY DESCENT. MASKS DEPLOYED, UNABLE TO CONTROL CABIN WITH MANUAL CONTROLLER. INSPECTED TAIL SECTION FOR BLOWN DUCTS, CHECKED OUTFLOW VALVE, PERFORMED DECAY RATE CHECK AND STOWED ALL OXYGEN MASKS AND PERFORMED DROP CHECK PER MM 35-20. NO DEFECTS NOTED.