I have come across a Rheem Rooftop that has been painted by someone. During the painting someone had the forsight to remove the Model Serial Decal. The problem is that that person has lost the decal. I am having trouble finding parts for this unit. Since I have no Model Serial is there anyone who could help in determining the Model of this unitl. I have a part number of the wiring diagram (Diagram# 90-42020-01 Date 2/11/83 Rev06). I also have the model number of both compressors (CRL1-0350-TFS). Several pictures of the unit are available. I really dont want to replace the unit is there anyone that could help?