Sorry to burst your bubble, but anyone would be reluctant (to say the least) to refund or exchange a machine after two months.
LD has one of the most liberal return policies out there (I should know, I work there) and at best you *might* get an exchange (not a return) after 30 days, but not two months. Probably not though, considering that everything *was* to spec (despite being too noisy for your tastes, I assume the machine was in good working order).
Realistically speaking, if it was bad enough to complain about after 2 days, then maybe you should have brought within the next few.
--PB