HP 8620 Officejet printer for repair or spares (Highfield NE39)

HP 8620 Officejet professional printer. It needs to be repaired to work. Error message is "improper shutdown" plus "paper jam" . It will not move on from these. No paper jam, have cleaned it but no luck. We have had it since 2015, fantastic robust All-in-one print/scan/ copy machine. sadly I dont have the time or inclination to repair it, and I have bought a new ink-tank printer. There are also some spare non-HP ink cartridges for it HP950 and 951s.