Dealer wanted to sell me a complete power pack ($700) and I was able to fix it myself in about 15 minutes! This was for a 2005 Keystone Hornet and the symptom was the extension motor would keep snoring and not extending the bolt all the time, it would jam and we had to extend the bolt to make it work and it just kept getting worse until it got working not move the slider. After replacing these parts, everything worked great and never had any problems again!