Mirage 1.8 Humming

I have a 1995 Mitsubishi Mirage LS with the 1.8 engine and 145,000 miles on her. When I take my foot off the clutch in neutral I hear a humming or hydraulic kind of sound from the front left. I was afraid it was the transmission and took it in. I had a new clutch put on and the trans fluid flushed and replaced but still have the noise. When I asked the tech about it he told me it was just a neutral whine and nothing to be concerned with. In other words its normal for the five speed.

Has anyone else had this issue? What would stop the problem?

Thanks for any feedback!