Just finished doing a belt replacement, rear carriage bushing replacement and replaced the fan in the power supply unit. All went back together well - it's a 24" unit, and no real problems reassembling.
Going through service calibrations and carriage assembly failed with a 58:11 error code. Saying the color sensor DeltaE failed.
I realized I failed to clean the color sensor before putting the printer back together. Crap.
Anyone have a trick for cleaning the color sensor without tearing the whole machine apart again?