Both the solenoid valve and the winter pump can be replaced easily. First you want to go to the OASIS ITR website and see the troubleshooting guide for your particular unit. The new units have different control boards. Next, the guys at OASIS ITR in Vancouver, WA are fabulous on the phone. Give them a call and they can walk you through the fix.
Full timers Radioman, The Nagrivator, & Woofie the Poopless Watchdog
08 Newmar Mountain Aire 4523