Did a head wash yesterday to try and recover my light cyan, finished wash and ran fill. Black/magenta head will not fill now. Took head carrage off and cleaned heads thourghly to assure proper seating, re-install ran fill still no luck checked vacuum on pumps, working. Ran nozzle wash for 30 mins, still no fill....should I remove heads, separate and flush with syringe and clean? or another suggestion?