I Have a 2008 Winnebago Sightseer 35J with the Digisync FLS slideout system. The problem is the bedroom slide out is not extending with a code 13. If I crank the slide out by hand it will retract by power. I replaced the motor and when that didn't work I replaced the power module with no results. When I try to extend, the front motor activates but the rear motor will not activate. I'm lost as to why this is happening. Any suggestions?