Do I need to appear at a judgment debtor examination on behalf of my company?

It is likely that the judgment was transferred to another entity, since it is unlikely that a dissolved entity would be continuing to act. What you don't know can hurt you. Hope this perspective helps!

Not sure about California, but in our state the judge can have you placed in jail for refusal to comply with the court order requiring the judgment debtor examination. If you attend, you are not required to answer questions about your financial situation, with one possible exception. If the question is about assets that were transferred from the company to you within the California Fraudulent Transfer statute, you may be required to answer questions about what happened to that asset and where the funds are if it was sold by you. There may be other issues in California of which I am not aware. As was said earlier, you should talk with a lawyer that handles debt collection matters for the debtor. Most attorneys will provide you with a free initial consultation.

The time to assert the defense that the corporation was suspended was before judgment,

If the court's Order to Appear names you, and orders that you appear in court, you should appear. If you do not appear, a bench warrant can be issued for your arrest. When law enforcement enforces an arrest warrant and puts handcuffs on you, it will probably be at a very inconvenient time. Whether the plaintiff can enforce a judgment is a different issue. It is possible that the judgment was assigned or transferred to another person or entity.