(a) After a conservator has been appointed, a petition requesting an order under Section 1873 may be filed by any of the following:
(1) The conservator.
(2) The conservatee.
(3) The spouse, domestic partner, or any relative or friend of the conservatee.
(b) Notice of the hearing on the petition shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1.