Seeing as how hes been around for more that sixty-five million years, (as far as this comic is concerned) its not likely that he has too much warranty left.
Duo: Uhhh, $3.82 and a half eaten bluberry muffin.
hmmm, he IS a robot, that means he must have been built by someone, but he's been patrolling the cosmos for so many eons whoever built him is likely long gone.
If THAT'S the case, then Duo is SO screwed...
No, that is not his ORIGINAL body. Duo's usual form is corporeal energy that has no real physical substance. Duo's current body (or more precisely PREVIOUS body here in the comic) was basically random scrap and parts Dr. Light manage to slap together upon the already damaged body Duo had when he first came to Earth during the events of Megaman 8 to fix him.