Hye guys. I really need help. I had an experienced on this issue. Mine generator disc indicator on the overhead panel not illuminate during test. Before test, my aircraft do experience generator out light and failed bearing light illuminate in flight. Pilot tried to disconnect the generator with the gearbox using generator disconnect system, however the indivator didnt illuminate and it forced pilot to shutdown #3 engine to avoid catastrophic mechanical failure. On the rectification after the flight, it found that the generator had broken with shaft do also broken. From my understanding, failed bearing light is due to mechanicle failure or maybe due to the broken of the generator. However, im still confuse that my gen disc indicator not illuminate during test after replacing generator, VR and GCP. When further rectification on gen disc assy, i did found spring loaded hardened pluger of gen disc assy was broken. Once replacing the plunger, gen disc test light illuminate. Can someone please explain to me?