Fluid Level

Check that the fluid level in the reservoir tank is within the specified range (MAX - MIN lines).
Visually check for any fluid leakage around the reservoir tank.
Check the clutch system for any leakage if the fluid level is extremely low (lower than MIN).

Fig 1: Identifying MAX And MIN Line Of Clutch Fluid Level On Reservoir Tank
Courtesy of NISSAN NORTH AMERICA, INC.