Just an update....went down to TCM (Ubi) this afternoon and was advised to surface the problem during 5k servicing which is quite soon (mileage at 4000km now). They say will take time to dismantle the steering rod to take out and check.
Mention something about 90degree design or something...thats y turning to full lock will hear the 'kok' sound. Then if they tighten the steering rod still same problem, then can go back change steering coupling.
Means got to go back one more time after 5k servicing if problem come back which i bet its very highly possible....haiz