I recently had a similar issue with my P9000 at the same 1.5 years of life. It was not presently the total missing lines issue yours has, but was showing some type of clogging, which moved between, Cyan, Green and yellow, and sometime Light Black. This was after 1.5 years and never a single clog. I had the extended warranty, and was able to get the issue resolved, at least for now. Epson replaced the entire capping station, had sent a head, but the repair person felt it was not needed, so far he was correct.
If you are looking at a new head and want it installed by Epson service, (not sure who does it in your location), for me it's Decision One, the cost of just the part in the US is $2500.00, if sourced from Epson. Add another 1K for hours of work. Basically very close to the price of a new P9000 and within 1K of a P9570 based on US pricing.
I would have upgraded to the P9570, based on the new features and fact that Epson decided to allow the end user to conduct head cleaning, and sell special wipes and solution just for this process and the head will move all the way over to the left where a door is available to get at the head. Problem for me is getting rid of the old printer, and having to pay 4 people to move the printers.
If you are only $800.00 off from a new P9000, I would sure consider a P9570.
Only issue I have read about on this printer is how the media center, (not sure what it's actually called) but it's totally different than the older P9000 and down the line. Seems that when the P9570 first came out there were some issues with this but it seems now better understood.
The repairs on the P9000 out of warranty I believe are only good for 90 days.
Paul C