Hola David -
xxx
Typical Boeing fire handle - shut down fuel, hydraulic, bleed air, electrical...
As a matter of fact think of this. In flight, your CFM-56 windmills.
Not too good for that engine driven hydraulic pump. They are expensive.
Maybe a good idea, to let some fluid "lubricate the pump" from time to time.
All that depends on the reason why you pulled the handle.
On the ground, in 747, we occasionally shut down the engines with these.
To see... if they work. Sometimes maintenance requests us to check them.
Some fuel valves sometimes fail to close, and engine runs on, and on, and on.
xxx
Brgds/
Happy contrails