Electric Control Box for Hydraulic Multiplier Valves

The media could not be loaded. I have been using these fasse 12 volt switch boxes on my tractors for several years, but the last one I bought last fall to install on my new John Deere 5075 cab tractor so I could use my flex-wing Bushhog and 3 point 300 gallon sprayer which I can spray 10 feet right or 10 foot left, or both at the same time. It worked perfectly last fall, and for most of the summer, but I was spraying my clover fields and one light bulb stopped lighting up while the valve was still spraying, and about an hour later the other light stopped lighting up, but both remote valves still worked. I had to keep looking at my spray bars to tell if they were on or off. I had to purchase the bulbs, but can’t find any information on how to change them. I tried them the next day and the left one is lighting up, but the right one still is not.Please send me a link on how to replace bulbs!