What was found
LAS - CABIN PRESSURE, CREW REPORTED THAT JUST PRIOR TO REACHING 34,000, CABIN DIFFERENTIAL PRESSURE WOULD NOT HOLD ABOVE 7.0 PSI, CABIN ALTITUDE CONTINUED TO CLIMB. CREW COMPLIED WITH CHECK LIST AND DESCENDED TO 28,000 WITH PACKS AT HIGH PRESSURE. MAINTENANCE FOUND HUGE PRESSURIZATION LEAK AT FWD CARGO DOOR THRESHOLD. REPAIRED THE FORWARD CARGO THRESHOLD SEALING AREA. REPORTED FOR PRECAUTIONARY PURPOSES. **SUPPLEMENTAL** WILL BE SENT ONCE RECEIVE MAJOR REPAIR FORM.