my 79 LE mgb has only 38000 miles and has been running great but now when i push down the clutch it doesnt always fully disengage and wont allow me to go into reverse....clutch resevoir is full and no leak spots under the car.....this is gettin to be a real problem because its my daily driver....any help greatly appreciated....also ive got a junked 1980 mgb with lots of spare parts if anyones interested