I think I have fixed it.  I switched out the RX-18 and the 3 wire harness and have now gone through 5 start up/ shut down cycles with no problems.  It works perfect now.  <div>
</div><div>I did some other tests before switching the main board and they did not help.  This seems to have solved the problem.</div><div>
</div><div>Thank you all for the great advice.  With your help I was able to find the pathway to a solution faster than I could have on my own.  Now I'm going to e-mail Phil so he can relax a little, I know he is busy right now.</div>