Clutch fluid

The resevoir seems to be loosing "clutch" fluid some where ie the actual resevoir or somewhere alomg ie the piping...suggestions?

The resevoir is mounted to/part of the clutch Master Cylinder. The line runs down to the slave cylinder which is mounted to the tranny bellhousing (near the starter on a 22RE). Either could be leaking, check under the dash near the clutch pedal and under the truck.