Recently one of our customers brought us a Canon printer, only about 3 years old.  The print quality was poor and we traced the problem to the print head being worn out.  This does happen eventually, these parts don’t last forever.  Fortunately this type of part can be replaced in a Canon printer but when I attempted to order a new one for this gentleman, I discovered that it had been discontinued.  I could not find a supplier who had stock so this customer had a perfectly good printer and no way to keep using it.  What’s going on Canon?