I bought a refurbished RCM and all the issues went away. I will take some time to more closely examine my bad RCM and attempt to properly repair it and keep it as a spare. I'm surely thankful for all the knowledgeable folks in the forum, and I'm glad I was patient and persistent and didn't have to take it in for what might have been a far more costly service (diagnosis, misdiagnosis, more expensive part, unnecessary parts, etc.)