I don't know if I can help you with that decoder question. I have a Märklin LGB electric lok that stopped responding to drive commands. I think it happened because there are sound file items and pantograph motors that take a bit of time to complete their direction reversal "dance" if you want to call it that. I was trying to uncouple some wagons over an electric uncoupler. A train needs to be carefully positioned in reverse over the uncoupler for it to work when more than a few wagons are being uncoupled (LGB symmetric hook and loop). I was rather quickly switching between forward and reverse when the motor stopped responding. I think all the back and forth commands while it was still in its direction change sequence confused the decoder. Lights and other functions still worked but the lok would not move. Just hitting STOP and letting it sit unpowered for a few seconds seemed to clear it up. It started working fine again.

You might also carefully check the connections between the motor and decoder adaptor board to verify they are OK. I had another lok that I had converted where a side crank pulled a motor wire from the decoder. I put in some zip ties to keep the wires clear of the moving parts after the repair.

Another totally unrelated hint about the browser connection to the CS3. This is by far the easiest way to access the CS3's built in help. Just click on the ? in web server menu bar and you can easily scroll through all the help pages. While you're at it check out everything else that is there. Some really useful stuff. The "Control" button on the far right opens a lok controller that I find much easier to use in the garden than VNC on a phone or tablet. I have trouble making sure curser with is where it needs to be when using VNC. My CS3 and boosters are inside the house and I control trains with my phone or tablet via WiFi.

Hi George - I've got a CS3 where as your's is a CS3+. I'm guessing that is the difference in Hardware Version numbers. Best wishes for a successful knee replacement.