If ink is clogged up to where the solenoid can't compress the line it might be the issue, or if you removed the lines from the solenoids they might not be reinserted correctly (I seem to recall doing that once). At the back there should be a few elbows for each ink line and a small linear line that goes through the solenoid and gets squeezed (the solenoid is what does the actual squeezing of course). You should be able to disconnect the elbows, then push the solenoid back and pull the small linear tube out to clean it.
All this takes place at the back of the printer, so if you're probing around up front you're in the wrong area (sounds like you know what you're doing though).
All this takes place at the back of the printer, so if you're probing around up front you're in the wrong area (sounds like you know what you're doing though).
