buddy bought a 445 at a auction , hyd oil leak right rear where clutch pedal hooks up, looks like a O ring popped out. any body ever change this? where to get a diagram of it. he,s gonna take it apart, [he,s a real hard head.] I told him don,t touch it till I asked om here ,went down tonight he,s got the seat and back sheet metal fender assembly off. any help appr.