You will not normally have to redo Raleigh and having already done the job for a while you will not do the full AET course, but a refresher.
What you need to do is take along your discharge paperwork and your last pay slip (if you've still got it) to your nearest AFCO. They will then seek approval to process you from Captain Naval Recruiting/Air drafting desk. They will then tell us at what level you will re-enter and at what payscale. You will probably have to re-take any promotion exams/courses.