What was found
WHILE CLIMBING THROUGH 11000 FEET, WE RECEIVED AN AMBER CABIN ALT CAS MESSAGE. WE LEVELED AT 12,000 FEET, RAN THE QRH AND MADE THE DECISION TO RETURN TO TEB. WE DID NOT LAND OVERWEIGHT. AFTER LANDING, THE PASSENGER STATED THAT THERE WAS AN UNUSUAL AMOUNT OF NOISE COMING FROM THE AREA OF THE EMERGENCY EXIT HATCH. OXYGEN MASKS MANUALLY DEPLOYED. INSPECTED EMERGENCY EXIT HATCH AND PERFORMED GVI ON DOOR AND FRAME STRUCTURE. FOUND BOTTOM LATCHES OF HATCH BINDING, SECURED EXIT HATCH. STOWED ALL PASSENGER OXYGEN MASKS. PERFORMED OPS CHK OF EMERGENCY HATCH. OPS CHKD GOOD. NO DEFECTS NOTED. PERFORMED CABIN LEAK, PRESSURIZATION CHK. CABIN LEAK/PRESSURIZATION CHECK GOOD. NO DEFECTS NOTED. ALL WORK PERFORMED IAW MM 52-20-05, 52-20-00, 21-30-00. 35-20-20.