Thanks for all your replies and compliments.
Well.... the problem has not been solved....
Last time the engineer tested my current and it read 60mA
Today, I did the test again with my own amp-meter. It is around 60mA/12.5V again (I waited longer this time).
I think it's a very normal reading as the technical menu says normal current drawn is 50mA as far as I know.
I will call MB services tomorrow... but it's very expensive here in HK..... poor me...