2009 model Triptronic 207 gearbox malfunction

Hello friends, I would like to share a problem I have experienced for the last 15 days, maybe I would be glad if they help me if there are friends who have similar experience before.
My car 2009 model petrol & amp; lpg peugeot 207 trendy (triptronic transmission), I noticed oil from the oil seal. and we immediately went to a master and changed the oil seal (I had to do it because I had no service where I was and I had no chance to get out of the province due to the task). Transmission oil was added to the vehicle around 1.5 liters. the malfunction lamp was on, the vehicle shifted to automatic gear and shifted, I stopped immediately, started the engine again, it did not cause any problems again. looked at the computer, error code 755 said from the gearbox, there might be a leak in the gearbox said it would cost 1500 - 2000 rubles ... then we talked to a member of the service that the gearbox should be reset ... and you are going 100km with the car without any signs of failure in the car. .. gave this fault warning 4 times and only when I slow down with the vehicle (red light, casist ..)
Thank you in advance ..

P0755 & nbsp; The gear shift information of the gearbox does not get stuck & nbsp;. & Nbsp; The equivalent of the malfunction code in the Peugeot can make many comments from this because there may be many reasons why it is not stuck in the gear. Clutch, gear synchronizer, gear shift actuator etc.

thank you, sure, sir, let's look at the service that I will leave this friday .. and more importantly how many will explode :), I will write the result here.