Wis. Stat. § 857.15
The judge may accept the written resignation of any personal representative. When a personal representative is adjudicated incompetent, disqualified, unsuitable, incapable of discharging the personal representative's duties, or is a nonresident of this state who has not appointed a resident agent to accept service of process in all actions or proceedings with respect to the estate and caused such appointment to be filed with the court, the court shall remove the personal representative. When any personal representative has failed to perform any duty imposed by law or by any lawful order of the court or has ceased to be a resident of the state, the court may remove the personal representative. When grounds for removal appear to exist, the court on its own motion or on the petition of any person interested shall order the personal representative to appear and show cause why the personal representative should not be removed.
Wis. Stat. § 857.15
A personal representative's erroneous assessments of law, reached in good faith, do not establish any basis for removal. DiBenedetto v. Jaskolski, 2003 WI App 70, 261 Wis. 2d 723, 661 N.W.2d 869, 01-2189.