The Director may conduct additional reviews and evaluations:
At a tribe's request;
As part of an investigation undertaken when the tribe notifies the Director of a violation or breach;
As part of an investigation undertaken because of a petition submitted under subpart E of this part;
As follow-up to a determination that harm or the potential for harm to a physical trust asset, previously identified in a periodic review and evaluation, exists; or
As the Secretary determines appropriate to carry out the Secretary's trust responsibilities.