Passat B5 GP Estate - Back doors lock

[mzKas]

Hey!

Already introduced myself so it's time for questions :

When i bought my precious, it was a cheap purchase mainly because of the rust and the passenger back doors not unlocking (back left unlocked sometimes, the right one never did).
After that, the left one, unlocks every time now, so that's fixed (i think).

But the back right, still never unlocks and i cant even ear the unlocking mechanism working, while i did on the left one, even if it didn't unlock.
No manual unlocking, not with the key, central locking, nothing. Tried pulling the locking "pin" but it always goes down and its a pain to pull it up.

Anyone give me a hand here?
Tried looking for a way to disassembling the interior but with the closed door its a pain...

Thanks!
Cheers!