C.R.S. § 4-9-618

(a) A secondary obligor acquires the rights and becomes obligated to perform the duties of the secured party after the secondary obligor: (1) Receives an assignment of a secured obligation from the secured party; (2) Receives a transfer of collateral from the secured party and agrees to accept the rights and assume the duties of the secured party; or (3) Is subrogated to the rights of a secured party with respect to collateral. (b) An assignment, transfer, or subrogation described in subsection (a) of this section: (1) Is not a disposition of collateral under section 4-9-610 ; and (2) Relieves the secured party of further duties under this article.