Have had a lengthy series of beeps and red flashes (around 20?) on startup over the last few weeks, since around the time I updated the firmware last. Finally got stats file and it reported F1 sensor problem. I confirmed that the F1 sensor was not working in parking mode while the other 3 work fine. Then I was surprised to find that the F1 sensor was warm to the touch, while the others were cool. Experienced this? Does not seem like connection loose otherwise it would probably not be hot! More likely basic sensor failure and probably needs replacement but it is not clear to me how I go about getting replacement so any advice would be appreciated. Equipment is about a year and a half old. Thanks!