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I would take a wait and see attitude on it and see if they renew or not. If they renew, then try to settle it. No need to kick a potential hornets nest now.
The court record will show that service was made in some acceptable fashion. Most states permit service by means other than phyical service upon the defendant after a failed attempt. You need to review the court record to see how service was asserted, such as by publication, before asserting lack of proper service as a basis for vacature of the default judgment.
I would begin by reviewing the court record......