I have a 2009 RXT-215 that has run great since we purchased it 4 years ago. It has suddenly shown a fault code "Low Voltage" P0056. Swapped rectifiers with no luck. Battery holding charge. The warning beep used to come on intermittently, and at times, took awhile to beep with flashing "low voltage". Now the :low warning" comes on the minute the ski is started. The ski also "pauses" when the start button is pressed, like it takes a second to turn the starter. Anyone have any thoughts?