What was found
CLIMBING THROUGH 19,000 FT, GOT MASTER WARNING 'FUSELAGE DOORS' WARNING LIGHT. DOORS PAGE SHOWED AFT BAGGAGE DOOR IN RED. NO LOSS OF PRESSURIZATION. AIRCRAFT RETURNED TO FIELD. MAINTENANCE PERFORMED GVI OF AFT CARGO DOOR AND DOOR FRAME. FOUND LOWER PORTION OF PRESSURIZATION SEAL NOT IN RETAINER. INSPECTED SEAL, CLEANED AND REINSTALLED. PERFORMED OPS CHECK OF AFT BAGGAGE DOOR IAW 52-31-00-710-801. DOOR OPERATES NORMAL. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.