Did you call the repair facility yet? They should guarantee their work.
I just got back from repair my Epson Stylus SX600FW scanner/printer. (It had needed following giving signal 'Paper Jam' although I do not believe there was any jammed paper - could see none + you usually see this from your last page. I must say though I have got the hang of it myself mostly, I've found the paper handling of this model ridiculously delicate.)
I guess in the workshop they zero or adjust various settings. Anyway now I scan, see the image preview seems OK, on Edit Page the whole page seems there, I save and only a quarter if the page is in pdf or other document resulting. Never happened before. Have waded a bit through instructions but not found. What should I be looking at?