Reading the part number off of that pic the pcb is part 520-7041-00. I would call stern or a distributor.
https://www.stern-spareparts.de/en/super-laser-led-board-520-7041-00_40235_12065
Those led look like they are through hole so you could probably replace the broken ones, or try reflowing the solder to see if a joint just got cracked.