You've just fixed a customer's printing issue and demonstrated to them how to prevent it in the future. What are the TWO actions you must take before the job is considered complete?

Depending on the company, you must give the client the appropriate documentation, which will typically contain a description of the issue, the day and time you were there, and a "big picture" summary of what was accomplished. In order to make sure they are still pleased with the service they received, you should also phone them a few days later. You probably wouldn't have a job for long if you told them to directly call you and you would charge less. Additionally, you wouldn't leave without speaking with the client. Ideally, let them test the changes you made to make sure everything functions well for them.