Any property acquired or discovered after the court order for final distribution is made shall be distributed in the following manner:

1. (a) If the order disposes of the property, distribution shall be made in the manner provided in the order. The court may, in an appropriate case, require a supplemental account and make further instructions relating to the property.
2. (b) If the order does not dispose of the property, distribution shall be made either (1) in the manner ordered by the court on a petition for instructions or (2) under Section 12252 (administration after discharge) if the personal representative has been discharged.