AIO HP Laser printer for parts or repair

Very lightly used all-in-one HP LaserJet MFP M139we wireless laser printer for sale for parts/repair only. Unit was working fine and then needed a new toner, so one was installed and then the printer stopped printing altogether. The yellow ? symbol keeps flashing, but it prints test/configuration pages from the printers front panel buttons only. I can't get to print anything from any device attached. Printer toner shows normal (full) and everything else was fine before the toner needed to be changed. It's in excellent physical condition. The flat bed scanner and copier is clean, as well as the test prints I've performed on it. It should be used for parts, or for repair if someone can fix it. There's no paper jams, nothing stuck inside either. It's being sold as-is with only the printer power cable. The new HP toner is not included. No toner is included with it, If you need some parts to fix another similar model, great. Of it you're technically capable to repair it, even better. Serious inquiries only. No trades, no barters, and no dealers please. Low ballers will be ignored. We can meet in the Jane and St. Clair area during the daytime or most evenings.