AliBaba has a point which I forgot. Some of the old GS gearboxes do have a triangular opening on the top side of the hole where the seal for the drive shaft is placed.
When fitting a new oil seal, close this small opening with silicon paste.
The reason, why oil from the paralever tunnel can enter the bevel has been said already. The seals just work one way. The seal on the bevel stops the oil from oozing out into the paralever, but does not stop oil oozing into the bevel from the paralever tunnel.
Good luck with the repairs.
Hans
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