GE Model GG50t06PVK - Every 2 days or so, my water heater shuts down with 3 lights light on the display illuminating (the 'warm' indicator, and both the "A" and "B" light). Recycling power resets the water heater and it works fine for a couple more days before the process repeats. Water heater is 2 months beyond the warranty (6 years, 2 moths old). Is there a place where I can find diagnostic codes? Does anyone have some insight as to what my heater is experiencing? Thanks! Jon