Which preposition to use with reexamination

of Occurrences 2%

On a reexamination of the record of the trial I am satisfied that the proceeding was illegal in substance, and therefore that the sentence was void.

to Occurrences 1%

At the suggestion of the United States district attorney, and with the consent of the Secretary of the Treasury, the matter was referred for a full and careful reexamination to three gentlemen, of whom one is understood to have been an experienced clerk of the Treasury Department of the United States.

Which preposition to use with  reexamination