What was found
AT 36,000 FEET, CABIN PRESSURE WAS CLIMBING THROUGH 8,000 FEET. WE DESCENDED TO 34,000 FT, & THEN TO 32,000 FT. DURING DESCENT WE RECEIVED CABIN ALTITUDE HI WARNING MESSAGE. DONNED O2 MASKS, DECLARED AN EMERGENCY, & COMPLIED WITH QRC & QRH PROCEDURES, DESCENDING TO 14,000 FT. CABIN PRESSURE HELD AS WE LEVELED OFF. DIVERTED TO LAS WITHOUT FURTHER INCIDENT. FLIGHT 3681. FOUND FWD CARGO DOOR SEAL UPPER RETAINER DAMAGED WITH DOOR SEAL HANGING DOWN AND NOT ALLOWING ACFT TO PROPERLY PRESSURIZE, PERFORMED TEMPORARY REPAIR TO UPPER DOOR SEAL RETAINER IAW SRM 52-00-02, ALSO PERFORMED PRESSURIZATION LEAK DOWN IAW AMM 21-31-00, LEAK DOWN TEST IS GOOD, ACFT PRESSURIZED. ACFT TO BE FERRIED FOR PERMANENT REPAIR.