You will encounter this easy puzzle just after exiting the park located in Holmwood Cemetery. You will find yourself in the back of the Future Defense Group building, and after exploring this area, you will find a locked door with an electronic lock.
Use an ultraviolet lamp and scan the panel. The solution is based on a random scenario (the three-digit code will be different each time). Start with the number where the fingerprint is most visible and end up with the least visible. The presented example shows the combination 694 (6 with the most visible fingerprint and 4 with the least visible).
