In the game Grim Fandango, we find out that the protagonist, Manuael Calavera, is working off a debt to the powers that be. Presumably, he committed a sin in his life which meant he had to work for the DoD before he would be allowed to make his 4-year journey to the 9th underworld.
Is it ever explained, in the game or out (interviews, publications etc.) what it was that Manny did?