[mikethedruid]

Larry, you are correct about changes made that do not always show up on the schematics. One can often find them in service notes. The Ryder manuals often have them in volumes subsequent to the original one in which the service information for the radio appeared. All the references can be found in the master index. You are right about, "If it looks like an original part, just replace it with a new one of the same marked value. That's what I do too when there is a discrepancy if I cannot find the information on a change in the service notes under changes.