I'm trying to resurrect an L7680 that was out of service for almost a year. I got the drivers downloaded an installed seemingly okay but I was getting yellow stripes in what should have been black text. The ink was all old enough that the printer said the cartridges were expired so I replaced them all but that didn't help. I have run the "clean the printhead" tool numerous times and it is getting better but it isn't quite back to normal. The attached file is a scan of the page that printed after the last cleaning. You can see yellow in the descenders on Line 1 and yellow at the bottom of every character of line 4.
Are there parts that can be manually cleaned or an advanced super-cleaning utility that I could run?