Short answer as already giving is yes, the front pump to converter seal…
Very long answer is there are multiple seals/gaskets that it can leak from…
070 the front pump or converter seal is the most common to leak.
034 is the front pump (converter) bushing, it can be worn and be the cause of the front pump seal to leak, but the seal can also just be bad/worn out… The (torque) converter drive hub can be grooved and can also damage the seal…the hub is what drives the pump gears (530)…
Not shown in the pic, each of the front pump bolts (777) can have a gasket that can leak..
311 is the (outer) pump body (square cut) O-ring can leak…
310 is the pump (for fluid passage) case gasket can leak…
Pic is of your A413 front pump assembly…
Installing the torque converter:
You have 3 steps you should feel/hear/feel when installing/sliding the converter in the bell housing,
1st one is pretty easy and it is to engage the splined input shaft into the converter,
2nd a tad harder is getting the converter to engage the stator (520) in the converter,
3rd is the hardest, and sometimes can be very aggravating as the 2 slots (or flat spots depending) have to line up with the notches in the (inner/drive 530) pump gear, you can with good lighten eyeball line up the pump gears and clock the converter (hub) to be able to engage if the old school spinning the converter does work, sometimes turning the transmission bell housing straight up will help with stabbing (installing) the torque converter…
Now the converter should be recessed into the bell housing about a 1/2ish inch give or take, if not and you bolt the trans up at minimum you will not be able to spin the converter, worst case you bust the front pump gears and or the pump body and or stator… .