Had a roland tech out to fix a cut calibration issue- long story- but ended up with a front cover open error. While he ordered parts to fix that error, he soaked the heads to avoid them drying out. Today when he went to put it all together ink had sucked way back in the lines and contaminated. He pulled a bunch out but told me to run black and yellow to get contaminate out. I’ve run this (should be black squares... obviously it’s blue) - circles are supposed to be yellow. Running in service mode. SP300V. How long should it take to clear lines with these prints? Am I going to hurt anything by continuing? Thanks.