danne77sthlm - you're welcome

Gil80 - this is what I call "the unit is on the edge" and it happens every now and then. Replace that Schottky with 1N400x so you have two 1N400x in series and it should be silent and stable.
coolxal - yes, you'll either get a pre-paid shipping label or they will dispatch an UPS courier to pick up the unit from your place, and with the second option they take most people by surprise because they usually don't notify you before the pickup, so unless you opt for the advance RMA, you should prepare the unit shortly after receiving RMA approval.
leighteam - you can connect it to one of the motherboard's fan headers that can be adjusted from the BIOS or some software and slow the pump down from there. Or to some fan controller. Just be careful to set it to one value and not to go lower than 1700 - 1800 RPM (you might see double the speed readout with H60, so you'd see 3400 - 3600 RPM).