Similar issues with mine - same year/model. In my case the auto trans (Hondamatic) was faulty and needed replacement along with the oil pump. Later on the shift motor (on the outside left of engine) also got stuck which gave the constant flashing like on yours. It would stay in one gear until it was removed & freed up. You can try that first - if that's all it is you're lucky. The new trans cost a fortune but the bike was in too good a shape to abandon.