Soft high pitched beeping sound?

Hi I have a very soft high pitched beeping sound coming from what seems to be my hybrid data drive on the right hand side of my Precision M4800. I managed to record it with my phone, Is there anyway to share it?

Dell doesn't know what it is, but due to the fact that the diagnostics says there is nothing wrong they wont do anything about it...... until something happens.

The motherboard has already been replaced.

The Graphics card has already been replaced.

The Hybrid HDD has already been replaced.

The machine is 4 months old!