3. Agreement to partially testify act as waiver?

No New Mexico law specifically addresses this issue. But it seems unlikely that a reporter's testimony to the effect that her story was true and accurate as published would work a waiver of her privilege not to identify her confidential sources or to disclose the confidential information that remained unpublished. Cf., e.g., Pub. Serv. Co. v. Lyons, 2000-NMCA-077, ¶¶ 1, 22, 129 N.M. 487, 10 P.3d 166 (holding that under Rule 11-511, party cannot "implicitly" waive attorney-client privilege by pleading claims to which privileged communications might be relevant, but instead must make "offensive or direct use of [the] privileged materials").