unfortunately, no
the only way it could be without disassembling is if something is stuck in it.
you should check for liquid/semisolid damage (squeaking probably means food grease, butter, ect. got in the trigger)
[guide|156129|https://www.ifixit.com/Guide/DualSense+Controller+v2+Adaptive+Trigger+Replacement/1561|new_window=true]
however, is your controller under warranty?
also many people are complaining of issues with the triggers on this controller, so i would expect a recall of some sort, but i would still try to fix it in case