Henry Vacuum Cleaner Fault?

Hi there, my wife dropped Henry down the stairs. It's still working but we noticed the high-low rocker no longer does anything. It it's always lit and the power seems to be very high all the time. Perhaps even higher than high used to be.

We carried on using it like this for a good few months then suddenly, noticed it was making sparking sounds though couldn't see any sparks. This was while it was off but still plugged in with the switch on.

We opened it up but couldn't see anything wrong.

It later caused my fuse to drop when we tried to use it again.

For the experts out there, will replacing the high-low rocker resolve this or is it likely to be a more serious fault?

Thanks!