1. Just like how you raised the mast, go to the Mast Control valve to the left of the mast. 

2. Turn the valve to “Lower” to begin releasing air from the mast which will start lowering. As the mast lowers, the umbilical should coil into its umbilical basket, but you’ll want to watch it to make sure it doesn’t get caught on anything.

Sometimes the last section of the mast may not come down all the way. This is normal, but you can grab that last section of the mast with both hands and push down or tug on the guy ropes if you have them installed.