On a c3200n error message says\r\nimaging drum

The only thing I can think of is, if it is still capable of printing, hold the ON LINE button for 2 seconds. The printer information page will be printed, and on it, you will find the "DRUM LIFE" remaining for C, Y, M and K drums.

I'd wager it's the K drum, anyway; unless you work almost only with color photos, that's the drum which is hit the hardest.

Isn't there a letter before that? K, C, M or Y? This letter indicates the color involved.