FINALLY....the noise was eliminated!!!
I was actually near immune to the morning sound (and when engine cools down). The culprit was coming front front left absorbers and spring where PML has replaced it yesterday!!
To recap (from Mth April to Sept), they replace with RIGHT new absorbers and whole rear absorbers and stabilizers. All were futile. Last resort was to replace with the front left absorbers and spring on 23 Oct 2013 since they replaced all other parts. And it works! Frankly speaking, we are still puzzled why the culprit was the front LEFT suspension and absorber and the car was less than 2 years old and 99.99% sure the sound was from the rear sector.
I'm glad i changed a new SA (not purposely but my old timer SA was on European trip) and the "new" SA gave me very logically explanation. However, each SA has diff experience. Anyway, i feel like driving a BMW now...all sorted and moral of the story:
1. Buy a BMW with warranty**
2. If problem cannot be resolved with more than 3 trips with same SA, change a SA. Least a diff opinion and proposal. (Hahaha)
** PML replaced all my cracked air con plastic at the side of the air con grille FOC. Earlier statement was not fall under warranty but guess they gave in to replace it as they could not address my suspension issue after 5 months where i highlighted to the new SA. Actually it was quite taxing for me to drive n leave the car there at PML for least 7 times, and taking taxi here n there. But i gave my fullest co-operation. They should be glad to have a customer like me as well! Takes 2 hands to clap