Just an update, I found a service manual online with some great troubleshooting tips and test stuff.
http://www.fourwheelcampers.com/NewD...atorManual.pdf
Covers many models
DIAGNOSTIC SERVICE MANUAL
AMERICANA & AMERICANA PLUS
RM 2351, RM 2354, RM 2451, RM 2454
RM 2551, RM 2554, RM 2652, RM 2662
RM 2663, RM2852, RM2862 & NDR1062