V10 transmissions

hello, for some time the switching processes in the lower gears became a bit rough and with constant driving there were speed fluctuations. Above all the switch back 3.->2. was very hard (in cold condition more clearly than warm) read out with VCDS –> Error 17125 + 17116 on it I had the gear oil level checked and when refilling exactly 3 liters missing! now the jerking 3.–>2. almost harder turn up again runs soft. has someone experience with it ? mfg norman