(a)
Subject to subdivisions (b) and (c), any petition or other matter filed or commenced before July 1, 1988, shall be continued under this part, so far as applicable, except where the court determines that application of a particular provision of this part would substantially interfere with the rights of the parties or other interested persons, in which case the particular provision of this part does not apply and the applicable law in effect before July 1, 1988, applies.
(b)
Nothing in this part affects any order, judgment, or decree made, or any action taken, before July 1, 1988.
(c)
Notwithstanding the enactment of this part:
(1)
An order, judgment, or decree made before July 1, 1988, shall continue in full force and effect in accordance with its terms or until modified or terminated by the court.
(2)
The validity of an order, judgment, or decree made before July 1, 1988, is determined by the applicable law in effect before July 1, 1988, and not by this part.
(3)
The validity of any action taken before July 1, 1988, is determined by the applicable law in effect before July 1, 1988, and not by this part.