Likely someone who does commercial lighting systems. Legrand has several versions of lighting control panels, just finding a contractor with experience on your particular system may be a little hard depending on where you are located.
Your best bet may be to go to Legrand's website and see if you have a local distributor, contact them and they will likely be able to direct you to a contractor familiar with the product line.
@catserveng thank you for your answer. You are right, this is a lighting control panel. After posting this, I found a solution! IntelliFix specializes in repairing these modules. I used them, and everything’s working perfectly now.