As far as I know a alternate flashing of the reg/green lights only suggests a problem. I don't think there is any code there.
I would think the RCL would be the controller and diagnostics should be available using the the impulse counting method (see archives). To follow up on the codes retrieved all of the diagnosic code reading info is located in the DM (diagnostic manuals). This is available online from MB (at a daily price) at www.startekinfo.com