DocJ,
If you take the time to read through all of the posts on this thread, I believe you'll find that changing your hydraulic pump will not fix the problem.
On Page 3 of this thread, the 2nd last poster identifies the issue as the 5th bow bungee cord. He has pictures as to where to find them (one on each side) and explains that they stretch with age and don't pull the 5th bow completely vertical enough for the tonneau cover to clear when opening and closing.
They can both be changed for new ones, or you could possibly try to reposition the bulk of the bungee cords towards the front of the car to gain more elastic pulling power (eventually you'd have to repeat the process every so often as they would slide to the rear with useage), or possibly try to shorten them (loop a small section of the bungee cord on top of itself and tie it with a cord or a zip tie?), to gain more pulling power.
Unless you know for sure that you need the pump remanufactured, I'd suggest looking closer at the 5th bow bungee cords before committing to that repair.
Gene
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