If a determination is made under subsection 229(1) in relation to a port, the Director who made the determination may vary or revoke the determination, or vary the conditions specified in the determination (including by imposing new conditions), if the Director is satisfied that:
(a) one or more requirements prescribed by regulations made for the purposes of paragraph 229(2)(a) in relation to the port are no longer being met; or
(b) the level of biosecurity risk associated with operations carried out at the port has become unacceptable; or
(c) a condition specified in the determination under section 231 has not been, or is not being, met; or
(d) the port is no longer required to be a first point of entry for vessels or goods to which the determination relates; or
(e) a circumstance prescribed by the regulations has occurred.