See attached pics -- Check the wire at position #6 on each PMag (green connector). Is it securely seated, can you pull on it and does it come loose?
From there, check the wiring to the GEA 24, J243 (37 Pin "D-Sub") pins 6 (RPM2) and 8 (RPM1); is the wire securely attached to the socket? is the socket securely installed into the connector/backshell?