Well, if it's any comfort, I've had a PRO-1000 for about two years and quite a bit of trouble. It's printed around "800 pages" and been through three ink sets. Currently it is not printing either the Photo Black nor Chroma Optimizer channels despite a new ink set and a lot of head cleaning. I'm waiting for an engineer's visit.
Last year it had failed to take-up the paper for a 1.2m panorama and had sprayed ink all over the vacuum platen for half of the length of the print before I realised what it was doing. An engineer came out and spent the best part of two hours cleaning the ink out of the platen and replacing the foam ink absorber strip which was literally dripping with ink !
However, this printer suffered a serious mishap during delivery from Canon and was dropped by the shipping company (UPS) resulting in the expanded polystyrene packing disintegrating. There may be a connection between this and my problems
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However Canon UK/Europe have been pretty good, offering me an ink set and maintenance cartridges at half price in compensation. And they have been willing to send engineers to fix the problems fairly quickly.
My only worry is whether the printer will hold-up for as long as yours !
If it is definitely the head that is your problem it is very easy to replace yourself and Canon give step-by-step instructions both in the manual and from the printer screen (a menu selected option). My previous experience with Canon printers that it is worthwhile replacing the head. One Canon office printer I had had a new head and waste ink collection tray before I had to give it away, still working, because the software was no longer compatible with my new Mac. It had done 37,000 pages.
And, finally, the PRO-1000 does make the most beautiful prints. I love it (when it's working !)