What was found
DEPARTED, EN-ROUTE, ON A PART 91 RE-POSITION. LEVELED OFF AT FL410. ABOUT 28 MINUTES INTO THE FLIGHT AND 4 MINUTES AFTER LEVEL FLIGHT, HEARD 3 BONGS COMBINED WITH A CABIN PRESSURE LOW MESSAGE FOLLOWED BY 9.6 DIFFERENTIAL MESSAGE. CONFIRMED THAT WE WERE INDEED LOOSING CABIN PRESSURE BY CROSS REFERENCING WITH THE CABIN PRESSURE CONTROLLER WHICH WAS READING A CABIN CLIMB RATE OF 2,000 FT A MINUTE. IMMEDIATELY, DONNED O2 MASKS, INITIATED AN EMERGENCY DECENT AND SQUAWKED 7700. INFORMED ATC OF OUR SITUATION AND INTENT TO LAND. AIRCRAFT LANDED SAFELY WITH NO FURTHER INCIDENT. CONDITIONS WERE DAY VFR.