What was found
AT 43K FEET NOTICED A SQUEEL FROM THE DOOR. THAT WENT AWAY FOR 5 MINS. THEN GOT THE RED CAS CABIN DIF 9.8. NOTICED CABIN PRESSURE WAS 12K SWITCHED TO ADC 2 NO CHANGE. PRESSURE CONTINUED TO CLIMB TO 12.5 . ALL MASKS DROPPED. DESCENDED 10K AND CABIN PRESSURE WENT TO 8.8. MX C/A: R&R MED INFLATABLE SEAL (P/N 1159SCB420-15 S/N OFF 482, ON 605). ALSO, R&R MED SEAL CONTROL VALVE (P/N 115SCH234-1 S/N OFF 460, ON V237), OPS AND LEAK CKS GOOD.