What was found
CABIN PRESSURE WARN LIGHT ILLUMINATED AT APPROX FL 195-200. NORMAL INDICATIONS UP TO THAT POINT AND NO OPEN DOOR INDICATIONS EITHER. DIVERTED. LANDING UNEVENTFUL. FERRY FOR REPAIRS. DAMAGED AFT CARGO DOOR SEAL NUMEROUS HOLES FOUND IN UPPER AFT RH CORNER. REMOVED AFT CARGO DOOR SEAL IAW AMM 52-31-26-000-801 AND INSTALLED SERVICEABLE AFT CARGO DOOR SEAL IAW AMM 52-31-26-400-801. OPS CHECKED GOOD. PERFORMED PRESSURIZATION OF ACFT IAW AMM 21-00-00-863-801. CABIN PRESSURE WARNING DID NOT ILLUMINATE. RETURNED TO SERVICE.