studio spt 250 issue

I have studio spt 250 with an intermitant issue, some time it works fine other times it stops and flashes -LWR - M- I open it up and notice two small LEDs by the driver chips flashing? I don't recall seeing them before, well not flashing anyway. they say LD1 and LD2 one is on the top edge and the other is on the bottom. I've looked over the schematics and don't see them, maybe I missed them? What are for and what are they telling me? :sad:
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