Hi. Welcome to Just Answer.
If the plumber made the repairs from the outside then the moisture barrier was disturbed. It has been my experience that when a barrier is disturbed by removing the soils next to it that it is inevitably cut, scratched, or pin holed by the work to remove the soil. If the barrier is not replaced, or at mimimum covered over with new moisture barrier extending at least 4' to either side, and sealed on the sides, you will have water incursion into the masonry.
Best suggestion is to remove the sopil in the area that the plumber exposed and properly apply a new layer of moisture barrier.
As for the gutter drain that too can be a major contributing factor. The warter must be drained away from the building. A leech line can not be used unless it is at least 20' away from the building.
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Thanks Home Smithy for your advice. I will dig down and see what they did. Am hopeful that the builder did NOT use the slotted type of black plastic pipe to drain the downspout away from the house. Any suggestion on what I should use to re-apply the moisture barrier?
DB, the best way is to coat the outside of the brick with hot tar. If that is not an option then applying a layer of 7mil plastic (black visqueen) against the building and extending it out minimum of 3' with a swale in the part that extends away from the building to catch any water and channel it off. Please see the drawing below.