What was found
(CAN) CREW DIVERTED DUE TO L2 DOOR SQUEALING DURING CLIMBING THROUGH FL195/7.4, PSI AND STOPS SQUEALING THROUGHT 29000, 8.2 PSI IN CLIMB. DESCENDING THROUGH 22800, ON DESCENT, 6 PSI SQUEAL STARTS AGAIN. MAINTENANCE PRESSURIZED THE ACFT AND FOUND L2 LOWER HINGE DRAIN VALVE ASSY STICKY. VALVE WAS CLEANED AND FREED. CABIN PRESSURE LEAK TEST CARRIED OUT IAW AMM 05-51-91. NO FURTHER LEAKS WERE NOTED. THE L2 LOWER DOOR HINGE DRAIN VALVE ASSY IS SCEDULED TO BE REPLACED.