Geberit concealed tank disassembly and reassembly

My toilet started leaking. Quick inspection revealed that the flush valve seal has some strange texture. Geberit's part number of the seal is 816.418. I bought a replacement in local shop, but they are also available on Amazon. Since I struggled a bit during the inspection, I filmed the disassembly and re-assembly while replacing the seal. I hope it saves you some time. --- Note: The flush assembly can also be removed without removing the inlet assembly. Since the manipulation space in the tank is smaller in that case, you can fold down the green and gray levers which stick up from the flush assembly. That makes the assembly shorter and allows you to take it out easily.