Like any other part of the 6.9 this is going painfully slow. I have tested and fixed each component of the system, yet it still only begins the first steps of startup.
I am planning on removing the system and putting on a workstation board so that I can more easily access each component and build a manual set of switches to simulate each step that the controllers does. At this moment I am suspecting that some or one of the thermostats or fuse links are not working. If they are not, then finding parts will be extremely difficult, though I am bidding on a 24V unit on ebay currently that I can rob a few parts from.
Another option is I found a brand new unit, but unfortunately 24V so it would require voltage converters to be installed in my system. most of the electrical parts are different between the 12V and 24v models.
Still I persist!
start up sequence attached