That’s exactly the issue I had. I tried same methods of cleaning and tightening belts, but it didnt work. Finally i got a replacement carbon rod kit and it solved my problem. No more error and smooth surface. Its been a month since i serviced and everything is still OK
Ty @alex.4141.b
They will send me a new carbon rod kit.
I hope my problems will be fixed soon.
I’ll keep you update.