Digital BW, The Print

I just looked at a purgefile I printed with the 10x loupe and lo and
behold, the banding does NOT have "white lines" but a variable black
level that looks like a "rag rug"pattern.  Is this a problem with the
feed mechanism?  It looks as if it truly has nothing to do with the
new CIS - I'm just looking closer now.  Also, the dropped white lines
I had mentioned are only in the first (upper) digits of the alignment
pattern, too, not the second,lower digits.(the "1" of "13" for
instance). Odd.
Looks as if I have a printer servicing coming up.  Any suggestions as
to where to go?  I'm in San Francisco.
Thanks again.
Chris