Coil whine is a term used to describe sounds that can emanate from components such as capacitors.This is usually caused by high frequency power draw...
I've heard that it's quite a lot, the Caviar Greens are meant as storage devices so tend to power down when not in use, they also tend to spin slower...
I feel your pain, I had to get the ECU on my car replaced about 3-4 years ago, they wouldn't even order the ECU in until I gave them a hefty deposit...
I am a moderator - I do not work for PCS, so any views are my own, and do not represent PCS's views.
However, if I delete any links in your posts, it is for a reason, do not reinsert them - all it will do is annoy me!