What was found
MSY-CLT - FLT 1278 - DURING CRUISE, AT THE TOP OF THE DESCENT, THE CABIN FLOW LIGHT ILLUMINATED WITH NO INDICATION OF A FAULT IN THE CABIN PRESSURE CONTROL. THE CREW INITIATED AN EMERGENCY DESCENT FROM 33,000 FEET TO 19,000 FEET. THE AIRCRAFT CONTINUED TO ITS DESTINATION AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT PNEUMATIC AUGMENTATION VALVE. (M)