MAN TGA – Servo Shift: Switching error in the power supply group

Hello first of all Have a technical question about a problem that occurred in my company. And that is that the vehicle is a TGA with Comfort Shift, 4 gear servo shift transmission. The defect was first only noticeable by a “jumping out” of the gears in the rear gear group, i.e. 5-8. At first only sporadically, it became worse the next day. The gears 5-8 could almost not be switched at all, 1-4 worked perfectly. The breakdown came soon after. N A few meters of drive and after reaching the 5th gear, the vehicle automatically disconnected the connection to the transmission. In the display it showed illogical gear indicators – from the 7th to the return gear. The system coupled automatically again, which became noticeable with an extreme switching error (very violent noise). Since then it is almost impossible to drive in the rear gear group. The gears can only be properly inserted with good luck. The truck is in use in urban traffic. – only for information. Error codes were read out with MAN-Cats II – no results were performed actuator diagnostics of all solenoid valves – all functional Comfort Shift operation also Does anyone know a solution to this problem ?