Thanks for the post guys. 

This is what I got from microbt.com support and also from their telegram support (linked directly from microbt.com):

1) Warentee is 365 Days for the M30/M31 series, not 180 (conflicting information from microbt website)
2) They pay for shipping both ways for repair
3) If you diagnose the problem with a part, the first repair attempt they will send you the part.  If that does not work, u must send your unit back to repair centre, a repair center is available in the USA.
4) somewhat broken english: they will send you a machine (refurbished or new) when you send yours back?

It sounds too good to be true?