Sony Home Theatre System ht-ddwg800 (Shooters hill)

Sony Home Theatre System ht-ddwg800 with remote control. The surround sound speakers and subwoofer all work well. Was working great until it flashed up with "protect". I'm sure if you are experienced in what the issue is then you have a cheap fix. I just do not have the time to sort the issue. So note it is parts/spares.