You are working in Revit MEP 2010 or lower.
You link in an architectural background Revit link.
When you look at the view on the screen, your lights are on top of the greyed out architectural t-bar ceiling.
When you print, the grey ceiling lines are on top of your lights (black lines).
There is no draw order control for linked Revit files.
Try changing your printing setting to Raster. Print-Setup Button-Hidden Line Views-Raster Processing.
Note: Looks like this has been fixed in 2011.