2001 SE7 Disco ACE Leaking

[StusRover]

Newbie here, hoping for some help. I recently bought a truck as a bit of a project. I believe the ACE is leaking, but can't figure out if its a hose, the reservoir, or something else thats leaking. is there any trick or process to help? the fluid is all over the place, so hard to point to a specific area. I haven't pulled the filter yet, but I assume I will need to replace it as well.

Any help would be appreciated!

thanks
Stuart