I had problem with my 92 300 TE making a clanking noise from the rear. Lots of trouble to diagnois. Turned out to be coming from the rear shocks.

We bleed the system and noise was gone.

So I would say yes they can be bled. See link below for my problem with shocks.
http://www.peachparts.com/shopforum/showthread.php?t=143256&highlight=hydraulic