We have a fixed SLC500 model 1747-L40A series C with 1746-A2 series A two slot expantion. It worked a year ago, but now has a CPU fault. When trying to get online it gives an unknown decompile error after it uploads. Tried using RsLogix ver 7.00, and an older version on an old windows 95 laptop. I found and tried using the A.I.500 upload utility but that gives error 17 decompile error. There is obvious com link as it shows the program number when connected and it tries to upload. We could really use to get this program off of it since we don't have a copy. Even if not, how can I download something new to it when it won't even go online? I found documantation on how to reset SLC500's to factory default, but it says that series C can't be reset. Please help.