Anyone ever dismantled a fan on a Dell laptop please?

I have an Inspiron 8200 which has two fans, one of which has gone. I have a
spares Inspiron 5000 which has a single fan in it. They look the same.
Taking out the whole unit entails dismantling the whole laptop and removing
the circuit board; and I wouldn't know where to get the fan unit. Can I
dismantle the two-fan unit in place and replace one of them? It seems
accessible but the power lead goes to the underside of the main PCB

They each SEEM to be held in with Phillips screws (but I may be imagining
it).