What was found
ON FLIGHT 4120, WHILE CLIMBING THROUGH 32,000 FT, THE CABIN BEGAN LOOSING PRESSURIZATION RAPIDLY. ACCOMPANYING THE LOSS OF PRESSURIZATION WAS A SIGNIFICANT VIBRATION IN THE FLT CONTROLS AND ACFT ITSELF. RAPID DECOMPRESSION EVENT CHECKLIST COMPLETED & EMERGENCY DECLARED. ACFT LANDED WITH NO INCIDENT. ACFT REMOVED FROM SERVICE. COMPLIED WITH AE WORK CARD 12-200-01, VIBRATION-DETAILED VISUAL INSPECTION. NO DISCREPANCIES NOTED. VIBRATION NOTED IN NR 1 ABOVE ATTRIBUTED TO THE OUTFLOW VALVES EXHAUSTING DIRECTLY ON FLT CONTROLS IN THE TAILCONE. R & R MANUAL CONTROLLER IAW AMM 21-31-02 AND REMOVED AND REPLACED PNEUMATIC OUTFLOW VALVE IAW AMM 21-31-04. AIRCRAFT RETURNED TO SERVICE.