If the lower seals leak it's because the left-hand side vent cap (some are not drilled) is plugged and its building axle pressure, drill a small pilot hole in the cap back side and it should never leak again.
Yes, they do but they DO not replace worn parts, if they find something worn you need to take it someplace else get it fixed then bring it back, it's a joke.
They couldn't even break loose a simple adjuster nut on my impala