5000 clutch woes

[Bill]

An employee recently bought an early eighties 5000.  Last night his
clutch went to the floor and wont come back up unless pulled.  The
pressure plate wont dis-engage, so he's stuck.  I looks like a hydraulic
system, and he has plenty of brake fluid and power steering fluid.  I
couldn't see any leaks.  Does anyone have any ideas?  We could sure use
some help.

Bill Abplanalp
'90 200 TQW