What are the symptoms of a failing drum unit?

Besides the 'Drum Error', signs of a failing drum unit include: 1. **Faded or patchy prints:** The image may appear light or incomplete. 2. **Streaks or lines on prints:** This indicates a problem with the transfer of the toner image. 3. **Print quality degradation:** The overall print quality may noticeably decline. 4. **Frequent Drum Errors:** The error message appears more often than usual, even after replacing the drum.