87 venture royale. Cruise shows no error codes when powered on. Get a green lite after self test but will not set. Have checked the usual suspects but found nothing amiss. Actuater holds vaccum and vaccum motor spins freely. Checked the control unit plugs as shown in manuel but get no power sweep when moving the set/decel switch. Manuel states the control unit is bad if this happens. Any ideas? If unit is indeed bad is there a way to repair it or get another one somewhere? I also just started getting an E4 code on CLASS today. Any help on either of these problems would be great.