hmmm... I know a little bit about electronics - a very little, largely what I picked up from my production-engineer father. The problem with that board is it's surface-mount technology, probably flow-soldered on a machine. SMT is notoriously difficult to rework - ie desolder the LEDs - without specialist tools and a steady hand. Even if you succeed, you may damage the components by overheating. SMT rework is such a specialist thing that most of the time they chuck the boards away, rather than bothering trying to fix.