755 ILCS 5/12-10

Further bond or security.) (a) If letters are issued to a representative without his giving sufficient bond or security or if his bond or the security therefor becomes excessive or insufficient in the judgment of the court, it may on petition of any interested person or on its own motion require the representative to give a proper bond or security.

(b) At each accounting of a representative other than the final accounting, it is the duty of the court to inquire into the sufficiency of the security and of the bond.