Your black text is going grey, or you're seeing ghosting and dark bands creeping across the page. The black image unit has degraded. Part number 74C0ZK0, Lexmark-made. This is the imaging component that handles your black channel — when it wears, every document looks a shade off. Swap in the new unit and your blacks go solid again
| brand | Lexmark |
| part_number | 74C0ZK0 |
| component_type | Image Unit |
| colour_channel | Black |
| category | Printing |
| subcategory | Ink Toner & Ribbons |