Just bought a house with a Coleman Horizon 400 in it. An older one - maybe 10 years old. Looking for a manual. Any thoughts? Jets seem ok, bubbler doesn't work (how much should a replacement cost?). Control panel is dark at night - should it light up? can we get a replacement panel? We don't think the ozonator works - UV bulb is probably dead. Where is the serial number on the spa? Ours is dropped into a deck and only one side is easily accessible. HELP!