For the valves, I would check the seals. I have heard of a couple cases where this was wiped clean, reseated and everything was then OK. If the valve is faulty, of course we would replace it (0101-1462) but this would be a fast solution if it applies.
The elbow fitting is not available for sale as an individual item, only as part of the reservoir assembly. The upgrade kit that I mentioned would include the reservoir and so would address this issue. We could provide 2 upgrade kits to keep the customers units in the same state.