Has anyone with a maintenance minder equipped Civic ever gotten an A3 or B3 message? The 3 is calling for a transmission fluid change, but the OM has no documentation on when that might occur. I'm assuming that procedure is a dealer one as the only way to completely change the auto fluid is with a machine. I've done many drain/fill operations on my cars over the years, but that only gets about 50% of the fluid out. I'm wondering what triggers a "3" code from the computer. I'm guessing the ECU does some calculation based on driving habits like the OLM calculation.