What was found
DEPARTING, A DUCT OVERHEAT LIGHT CAME ON & NOTICED A SLIGHT BURNT SMELL. THE CAPTAIN DECIDED TO RETURN. THE LIGHT STAYED ON DURING THE RETURN, LANDING & TAXI INTO THE RAMP. THE PRESSURIZATION & AIR CONDITIONING SYS WERE INSPECTED. A CONNECTOR TO THE CLIMATE CONTROL BOX WAS FOUND TO BE LOOSE & MAKING THE DUCT OVERHEAT LIGHT COME ON & OFF WHEN MOVED. THE CONNECTOR WAS TIGHTENED & THE ACFT WAS RUN UP ON THE GND, NO FURTHER ISSUES WERE NOTICED. A TEST FLIGHT WAS ALSO COMPLETED WITH NO FURTHER DISCREPANCIES.