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I am experiencing an oil leak at the connection of one of the oil cooler lines (in red circle). Before I mangle some thing, does anyone know if I can pull the hose off at the brass fitting and replace an o-ring?
Looks like the circled fitting is crimped on, meaning it wasn't intended to be removed. If you could find another such fitting, unused, you might be able to remove the crimped fitting by careful use of a hacksaw or Dremel tool with a cutting wheel. You'll need access to proper crimping to reassemble.
I had a new set of hoses made when I added the oil cooler to my e9. A good local hose shop can do that but the fittings probably won't look factory. Of course the factory never jacked up the e9 engine compartment like I did to mine