What was found
MAIN CABIN DOOR WOULD NOT OPEN FOR APPROXIMATELY 3 MINUTES DUE TO ACOUSTIC SEAL NOT DEFLATING. WE WERE ABLE TO OPEN THE DOOR USING MORE FORCE THEN TYPICALLY NEEDED TO DEPLANE PAX. SIGN OFF. INSPECTED/CHECKED CABIN DOOR SEAL AND VALVE OPERATIONS, NO DEFECTS NOTED. PURGED DOOR SEAL BY INFLATION/DEFLATION OF DOOR SEAL WITH DRY NITROGEN SEVERAL TIMES. RAN APU & ENGINES TO PERFORM ADDITIONAL PURGES AND OPERATIONS CHECKS ON CABIN DOOR SEAL. RAN ENTRY DOOR SEAL THROUGH SEVERAL MORE CYCLES. OPERATIONS CHECKS GOOD. MX IAW CE560XLS MM52-10-04.