H80i clicks, if positioned normally.

I've had my H80i for about a year now (from an RMA'd unit), but once more it seems to be getting the ever lovely clicking sounds. However, I found out if I tilt my case up about 30-45 degrees back, it stops making noise completely.



I'm wondering if I should RMA this unit or if I can let the air bleed out of the pump to somewhere else, as I heard it's air in the pump that makes the clicking sounds.



The case is a 250D.