What was found
CLIMBING THROUGH APPROXIMATELY 14,000 FEET OBSERVED NO AIRFLOW COMING FROM THE AIR VENTS, CHECKED THE CABIN ALTITUDE AND IT WAS 9,000 FT AND CLIMBING 1,000 FPM. BEFORE PROCEDURES, CABIN PRESSURE AND MASTER WARNING LIGHTS ILLUMINATED DURING DESCENT THROUGH ABOUT 12,000 FEET. DECLARED AN EMERGENCY. EXECUTED CABIN ALTITUDE WARNING IMMEDIATE ACTION ITEMS FOLLOWED BY COM PROCEDURES. AT AN ALTITUDE OF 9,500 THE CABIN PRESSURE WARNING LIGHT EXTINGUISHED. ACCOMPLISHED ALL CHECKLISTS AND LANDED WITH NO FURTHER ISSUES.