What was found
CAB, DOOR ILLUMINATED AT APPROX 11,000 FT CAB ALT, ILLUMINATED AT APPROX 13200 CAB ALT INDICATED 10,000FT ON INDICATOR MADE IMMEDIATE DECENT TO 10000 AND RETURNED TO JAX DURING DECENT CAB ALT AND CABIN DOOR WENT OUT. PURGED DOOR SEAL AND REPLACED DEFECTIVE CABIN DOOR SEAL INFLATION HOSE.