Anyone got a service manual for the SP300V, I need instructions on removing and replacing the print head. To many problems with the black head, to expensive now days to buy a new one. Anyone got experience with having one recovered by someone like Printhead 911. I know risky but at $900 a head plus labor. Might be worth a try. All nozzles are firing, looks like deflected nozzles, tried soaking by filling up the caps but no luck.