The RCM is the Relay Control Module located in the box by the battery. It is the one closest to the engine.
There is a known problem with 3 of the solder connections on the board, these must be stripped of solder and re-soldered.
Forum member tighed1 provides this service for a fee of $20.
Look up "Mystery No Start"
https://www.crossfireforum.org/galle...lose2.JPG?9679