Comment 1 for bug 1809287

The messages are correct. There isn't any [laserjet_mfp_m28-m31] entry in models.dat, as you can check.

When did you get the messages? When printing or scanning? Setting up? Is the device USB or network connected?

Post the outputs of

  avahi-browse -rt _ipp._tcp
  avahi-browse -rt _scanner._tcp
  avahi-browse -rt _uscan._tcp

for the device.

--
Brian.