Hmm it could be that they have exhausted / running low on their supplies of mainboards, thus requiring a lead time of 1 to 2 weeks.
i was lucky i got my phone back in time before this 'shortage'
if i sent my phone a week ago and now 1 week later i get this kind of message telling to wait 1-2 more weeks i would probably demand they extend my warranty by the amount of waiting time it took for the servicing because to me, an almost 1-month turnover time is beyond reasonable
just teasing you lah