From the pic, it appears the towel is under the 'T' fitting. If that is the case, you can undo the crimp by inserting a straight, but slim profile screwdriver under the crimp flap and work it off its retainer. But...... when the crimp is loose, it still will be difficult to remove the pex pipe off the barbed fitting.
I just did some plumbing to put a new bathroom in the basement and had a plumber rough in the piping. He used PEX, and left the pipe stubs through the wall. I was very apprehensive of doing the work myself, but put my 'big boy pants on' and bought the crimping tool and crimps, ($40 at Lowes) and did the final connections myself. Much to my surprise it was a piece of cake. One of the reasons I got the tool was that RV's use the same system, so I thought this was a great investment. The water has been turned on in the bathroom for 2 days now and narry a drop leaking anywhere. While I have used Shark Bite fittings I was not confident as the fittings can spin in the pipe, which did not seem right.
Anyway, I would try to redo the connections in that area with PEX, and buy metal fittings instead of the plastic ones.
Good luck
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