You are going to need to specify exactly what the problem was with the juror(s) qualifications and in what jurisdiction the indictment was handed down to have any hope of a helpful response. A challenge propter defectum is an old phrase that refers to challenges based on some personal problem in the juror himself (e.g. minority, alienage, etc) that would render him/her ineligible to be on any jury and a challenge propter affectum refers to a challenge based on some circumstance, like being related to a party to the case, that would render the juror ineligible to serve on that particular jury panel, though he/she would be eligible to sit on other juries. My state no longer uses those old Latin phrases, but of course the concepts still remain. But it matters exactly what the alleged problem was with the juror and the jurisdiction as each jurisdiction has its own rules of procedure. I agree with the other responses that someone seeking to challenge an indictment on the qualifications of a grand juror really needs a lawyer.

