Had the front driver side differential seal replaced twice. Thinking either shop is receiving the wrong seal from their supplier or perhaps the axel shaft itself may be the culprit. Going to be looking at the vent hose today to make sure it isn't a blocked vent, but any other ideas? Has anyone heard of it being the axel shaft just being being worn that can be the issue rather than the seal? No noises/clunking or irregular running. Anyone ever used a heavier duty seal if there is such a thing?

EDITED - Title asked for pics of vent hose, but i found its route and cap under the Brake MC and tested same. Found to be clear when tested with compressed air.