Greetings everyone! I am currently helping with the repair of a hydraulic YALE forklift in my firm. The forklift is operating at very slow speeds and we have found out that the electromagnet which regulates the oil valves responsible for the speed of the vehicle is not being fed enough power, therefore not controlling the valves properly and impeding the speed of the vehicle. We believe to have narrowed down the problem to the control diodes of the forklift (which when first changed, allowed the forklift to operate at full speed again but diminished back to lower speeds after a few days) which we believe need to be changed. Any ideas on where I can find these and buy them? The diodes are shown in the pictures attached to this post. Thanks!