Epson printer/scanner for spares or repair (Caversham Heights RG4)

Epson XP-412 A4 printer/scanner (like this: https://www.epson.co.uk/en_GB/support/sc/epson-expression-home-xp-412/s/s1219). Scanner works fine. The printer goes through all the motions but prints poorly. I have tried all the usual maintenance actions without success.