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Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
To be honest if the system worked before the bumper was replaced then the shop most likely damaged the wiring to one or more sensor on the bumper when they removed your old one .BUT if the bumper was in a small accident could of been this.
The sensors will not reset after 50 miles this is not true.....
Best way to see what what has failed is to have the Jeep hooked up to a diagnostic scan tool and check for park sensor malfunction codes .this will let you knw which ones have failed ,circuit malfunction etc.
Or go back and ask them to please check all are connected and no wiring is damaged from the repair .
Need further assistance with this issue then please get back to me with the reply box below .After rating there is no further cost for any other question relating this issue .Kind regards Greg