Thanks for the update.
I had a similiar noise problem with my ES EReader pro, which I bought from ES via Amazon. I complained, they asked me to send it to them and even arranged a pickup from my home (living in Germany) to Spain. After 3or 4 weeks (can't remember) I got the thing back without the clicking noise, so I have to say, their service in my case was very good. I didn't pay a cent for the shipping or the repair.
Regarding your problem:
I opened my device since this several times which is not difficult. If I remember correctly there is a cable to the wifi antenna, which can be lose. But I guess the local fixxer guy has allready checked that.
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