I typoed a bit on this one... The machine doesn't have 46K... it has 64K! Still... the Dev units are supposed to be rated for 600K, so I think we might have a bad unit.

I did blow out the interior of the machine, including the transfer roller after removing the drum/dev/fuser units. The drum was scored, so I wound up rebuilding that... plus did a full developer dump/replacement, and clean/adjust the doctor blade. (It was a little on the high side)

I have a feeling the "Previous owner" might have ..."Borrowed" the drum/dev from my machine to help out someone else, and gave me theirs to replace them.

That's the only logical explanation for a drum rated at 300K to be scored like this one was at the edges.