What was found
CREW ENCOUNTERED CABIN ALTITUDE WARNING INDICATION WHILE IN CRUISE FLIGHT AT FL410 ON 6/18/2009, CABIN ALTITUDE INCREASED TO 10,000 FT PLUS. PERFORMED DESCENT TO LOWER ALTITUDE AND DIVERTED. FERRIED ACFT FOR REPAIRS IAW MEL LIMITATIONS. FOUND RT BLEED AIR MIXING, REGULATING, AND SHUTOFF VALVE ASSY. LOW PRESSURE SERVO NOT RESPONDING TO COMMAND INPUTS. ALSO NOTED FILTER ON CABIN PRESSURE CONTROLLER LAYING LOOSE ON TRAY BELOW, RETAINER MISSING. REPLACED RT BLEED AIR MIXING, REGULATING, AND SHUTOFF VALVE ASSY. WITH OVERHAULED VALVE ASSY. REINSTALLED CABIN PRESSURE CONTROLLER AFTER REPAIRS. SHIMMED LEAKING LT COCKPIT SIDE WINDOW AS REQUIRED. CABIN PRESSURIZATION SYS OPERATIONS NORMAL ON GROUND TESTS.