One of the lamps on the Cooker Hood blew the other day while on. The other lamp remained lit at this time. After switching off the lights and replacing the lamp neither light came on. The extractor fan has remained to work throughout. I have taken the Cooker Hood apart and can’t find any fault. Is there an internal fuse that I have missed? I have read that lamps blowing can affect the micro chip switch panel for the lights only. Is this information accurate. The Cooker Hood is several years old. Is it worth just replacing the Cooker Hood? Thanks.