You will have to pay certain fees for the enforcement officer's services. Attach the original Affidavit of Service to a copy of the Notice of Entry and Judgment that was served. 9.A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. Interrogatories in Aid of Execution are up to fifteen (15) written questions to the debtor about their assets and income. P. Rule 33(a) limits interrogatories to 25 in number, including subparts. Customer: I received a letter of interrogatory in aid of execution from a creditor in the mail. It's for a credit card debt. Interrogatories are one form of discovery in a lawsuit. An interrogatory is a written question from one party to the lawsuit to another party to the lawsuit. A free online service to help users prepare court documents to file for certain case types.