. . . [A] probation revocation order operates not as a determination of guilt or innocence as to the question of whether the defendant violated the terms of his probation, but primarily as a reassessment of the correctness of the original sentence." People ex rel. Gallagher v. District Court, 196 Colo. 499, 502, 591 P.2d 1015, 1017 (1978). Thus, once a trial court has revoked a defendant's probation, it is authorized to impose any sentence that could have been imposed originally for the underlying crime.