Vertical line on Agfa SnapScan 1212p

I have an Agfa SnapScan 1212p, and I recently noticed a miscolored
vertical line that goes all the way from the top to the bottom
of the scan. This is what it looks like when I scan the entire
area without putting anything in the scanner:

#

The problem is much less visible when a real picture is scanned,
but I can still see it. I cleaned out the flatbed glass as good
as I could, but it made no difference. This scanner is several
years old; is it common for scanners to break down in this way?
Should I just get a new scanner, or is it something I can fix?

I have searched for this problem on Google, and I found several
suggestions, like opening up the scanner and cleaning the optics
with compressed air, but I was hoping to get some suggestions
specific to my case, now that people can see exactly what my
problem looks like.

Thanks in advance!

--
Haakon