I have a Polk Audio DSW Pro 600 subwoofer that is currently blinking quickly between amber and green. For the first about 30 seconds or so, the LED light will be green then it flashes very quickly from amber to green light. I took the plate out of the subwoofer cabinet. I read other threads where they said it could be a fused issue but I couldn't find the fuse in here. Perhaps I don't know I'm looking for. Below is an image of the plate I took out. Any help is much appreciated.