Digital BW, The Print

I'm not sure what happened.  I've been printing happily for a year 
with a 1270--MIS VMs and six months with a 1280 - color perpectuals.

Today I got clogging in both machines at the same time.  Not paper 
specific, nor setting specific.  So I pulled the cartridges out of 
the 1280 to see what could be seen.  Now there's major air in the 
line, so I've likely lost the vacuum.

Suggestions??

Will cull through the archive in the meantime and see what's been 
covered.

Thanks,
Cleavis