What was found
FLT 205 - FLL - PASSENGER OXYGEN MASKS DEPLOYED AT TOP OF CLIMB, 31,000 FEET, NO PRESSURIZATION PROBLEM PRESENT. BAROMETRIC SETTING WAS AT A VERY LOW SETTING WHICH CAUSED A HIGHER THAN NORMAL CABIN ALTITUDE. MAINTENANCE PERFORMED AN INSPECTION OF SYSTEM AND OPERATIONAL CHECK OF OXYGEN MASKS IAW DC9 MM, CHAPTER 35-20-3. ALL CHECK NORMAL AND MASKS STOWED. AIRCRAFT RETURNED TO SERVICE. (M)