Digital BW, The Print

I have an Epson 1160 running the MIS Full Spectrum inkset with a CIS 
bulk ink supply.  It has basically been trouble free for a couple of 
years, until today.

I decided to do a few prints.  Since I had not used the printer for a 
bit I decided to do a few head cleanings and a nozzle check before I 
started printing.  Nothing out of the black head (all other heads 
fine).

I did a few more cleaning cycles then parked the head on Windex 
saturated the shut down sponges overnight.  The next day still 
nothing from the black head.

I removed the supply line from the black head and attempted to push 
the ink in the line back into the supply bottle with a syringe.  The 
line is plugged.  I worked with the line a bit and it seems to be 
full of a vicious sludge like material.  I still do not have the line 
clear.

An interesting side note; I have a friend running the same setup and 
he recently reported the exact same problem.

Any other elist members with this problem?  Any proven remedies?

Enjoy!   Lon