DD Series 60 oil leak

[Bamagfc]

I have a new (my first) oil leak on my engine. It is up high behind the alternator but it is not the alternator oil return line. It is running down the curb side of the engine. I am losing 1 quart/250 miles. The leak started after I got it out of the repair shop for some extensive work which included replacing most all of the hydraulic oil lines. I have clean the engine and I am searching for the leak. Any ideas? Thanks in advance.