For quite some time, we've had a dark horizontal line near the top of documents printed on our Brother DCP-L2540DW. On occasion, it interfered with seeing what the printed information was. I took the time to try a thorough cleaning of the drum yesterday. It seems weird to me that a single line appeared as the I would have thought it would appear multiple times if there was an imperfection on its small drum. I have had the monochrome laser printer for five years, but we only print around a ream per year.
Anyway, an el-cheapo replacement drum assembly that the Amazon guy just bought seems to have fixed the problem. Accessing the printer seems even easier now with our new router. In fact, I reserved space on our new home network router just so the device will always receive the same IP.