The Director may conduct additional reviews and evaluations:
(a)
At a tribe's request;
(b)
As part of an investigation undertaken when the tribe notifies the Director of a violation or breach;
(c)
As part of an investigation undertaken because of a petition submitted under subpart E of this part;
(d)
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
(e)
As the Secretary determines appropriate to carry out the Secretary's trust responsibilities.