Nothing in this article shall be construed to impair the rights of the holder of any lien on a manufactured home created by mortgage or otherwise prior to August 1, 1949, which remains unreleased and the undertaking which the lien thereof secures remains undischarged. Nothing in this article shall be construed to relieve the holders of such liens of the duty to file such instruments respecting the undertakings secured thereby as may be required by law to preserve the liens of such mortgages unimpaired.
C.R.S. § 38-29-126