406 Hydraulic Block

Hello Peugeot Lovers

My vehicle is 2004 model 406 St Ov. 7 months ago, sk lamps came on. Afterwards, these fault lamps kept on when the car warmed up. I changed the gearbox oil. Sk lamps are no longer on. But it is knocking while passing from 1 to 2. The update was thrown at the Peugeot dealer. The faults were deleted. (Pressure Errors) cut off at a moment's knock but again, a little knock started. The gearbox model of my car was AL4. Unfortunately, this gearbox is said to be normal. What are you guys, please let those who know about it. Best regards,

In the 406 306 206 models, the gearbox has been used since 99, except for the new ones. These gearboxes are flashing sports snow lights in a chronic distressed body, sometimes a valve control unit from solenoids. I think look at this before changing blocks first

Thank you my friend