CA Prob Code Section 2323

(a)

The court may dispense with the requirement of a bond if it appears likely that the estate will satisfy the conditions of subdivision (a) of Section 2628 for its duration.

(b)

If at any time it appears that the estate does not satisfy the conditions of subdivision (a) of Section 2628, the court shall require the filing of a bond unless the court determines that good cause exists, as provided in Section 2321.