Hi you have to take the hinge side - side panel off to get at the retaining plates. For future reference only undo the top and bottom and then wiggle the door out.
A pleasure - same thing happened to me the first time I did it, a job that should have taken about 15 minutes took over an hour but we live and learn. Could I ask that you kindly rate the information by selecting from the star rating system at the top of the page. If you need further help do come back to me. Thank you for using JA and have a good bank holiday weekend - Ian