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...