To answer your questions:
You said you cleaned the printer recently, but please clarify: did you do cleaning cycles thru the printer utility, and/or did you follow our instructions to manually clean the printer's capping station, wiper blade and bottom of the print head?
I followed another set of instructions but they covered the capping station, wiper blade and bottom of the print head.
What is the humidity and temperature in your printing environment (outside levels differ from inside)?
Current humidity is 76%, with temperature in the mid to high 20s Every now and then I can't bear the humidity and turn on the AC for a while
Your LC and LM carts are empty, and Y is very low- what are the physical ink levels of the other five carts?
LLK 1/3, LK 1/4, K full having just put in the Photo Black, C 1/3, M 1/4, Y 1/8
Does ink leak from the cartridge exit valves when carts are removed from the printer?
There is a little ink from some carts but a wipe on paper clears it and no more comes out. I have had the matte black sitting on a paper towel for 24 hours with no ink loss.
Having dumped all that ink, I will now follow your cleaning instructions on YouTube and install the waste kit.
I have just run a nozzle check, and it looks like B, C, and M are OK Y and LK are very light so it's hard to tell, and LLB is invisible. So it looks like I now have two empty carts with the rest perhaps working. Is there a better test than the nozzle check? I have a test image for a colour environment which has bars of solid colour.
Just to complicate matters, I now have Epson Printer Utility Lite which seems to have replaced the old utility. It only has Nozzle Check, and Head Cleaning buttons. Thanks you Epson.
I have now cleaned the printer as per the YouTube, and can report that a couple of carts full of ink goes a long way. I have a bin full of bits of paper towel with black and red on them. As an aside, the Piezo flush comes in a bottle with the hole to take the blunt needle only so the syringe in the cleaning kit doesn't fit.
I will now wait for an update from Dana. I'm not going to try filling the two empty carts again.