Can't tell you where to get a replacement, but I can tell you our experience. Our Actia odometer had the same problem. We took it to an RV dealer and they had to remove the unit, send it to Actia, who fixed it and sent it back. In our case, it was removed on a Monday, overnighted to Actia who fixed it on Tuesday, then overnighted it back and it was installed and we were ready to go Wednesday.
Jerry & Shirley Friedman; Dusty & Cricket
2014 Chevy Silverado 3500HD
2015 Mobile Suites 38RSSB3