VW B5 automatic ... leaking - Passat B5 - leak from the chest

Hello to all forum users!
For a week I have a red oil leak from the hole I don't know from the bottom of the gearbox. To this day it leaked (dripping) at a standstill, currently only when the gear is engaged and the "gas" added (car on a lift). The stain after more than 24 hours of parking was about the size of the steering wheel and about 1 mm deep (after driving the entire car tunnel splashed). Interestingly, I did not notice any changes in the work of the box or any disturbing sounds.
By. compact case DMX 01N 300 036CX or LX, 38/13.
Times are difficult now and the repair of the box may exceed half the value of my car
I'm not a professional in the field ... but after reviewing the diagrams at Uncle Google, I suspect this hole as a search to signal problems with the sealant in the drive shaft.
Thank you in advance for your help.
Greetings! robert

Check if there is oil in the differential and what color.

romuald-f wrote:

Check if there is oil in the differential and what color.

ok, let me know on Monday (the car was left in the workshop) ... thanks for your interest

pimpekR wrote:

romuald-f wrote:

Check if there is oil in the differential and what color.

ok, let me know on Monday (the car was left in the workshop) ... thanks for your interest

today, after unscrewing the screw in the differential came something about the consistency of jelly in beige color (there was obviously excess - because the stain in the photo is just what splashed after removing the plug-stopper), the oil in the diffuser was replaced with fresh 75W90 and tomorrow I will try to drive a few kilometers a then check the oil level in the hot "automat".