P.S. I've sent the 'noise' issue to Boeing...no reply yet. I'm due a sector on QR next month to Doha...so perhaps I need to record the noise on my mobile and send as proof that it's not my hearing issue...heheh.
What can I say...it's deffo an issue...or with ears that can detect such high-pitch ongoing noise. (P.S. I was only joking...I don't have a hearing-aid yet). lol.