Hi Sean,
I know at least on the CA18DE that the warning lights come on when your engine misfires from a coil. Not sure about the RB motor though - is it running really rough when the lights come on? Is it just on idle or when you apply throttle? One way to check, providing it does it on idle, is removing the ornament cover and looking for stray sparks under the coils. If it's doing it on higher rpm's, then you'll probably need a spare coil and replace them one at a time.
Best thing to do from time to time, even if you don't have any coil problems, is to remove the coilpack, clean up the tips for any carbon deposits, then silicone spray the inside of the boot and the coil body.
Hope this helps.
Cheers
Howie