Have the R1800 and when I start to print a CD there is a rather loud
crunch or click type noise somewhere in the rear, sort of under the
paper feed.

This only happens with CD printing. Prior to the tray being drawn into
the printer.

Thinking it needs a dob of lubrication.

What I'm after is a manual so I can remove the covers to trace the noise.

Or has anyone else had this problem?