Here’s how I did mine (scroll a little down that first post): Form 2 Heater Cable Repair
But it entailed taking certain measurements before I removed the carrier. I was very careful, and after it was done the results were better than before. Of course if you mess up Formlabs won’t be able to help and will tell you the printer needs to be shipped back to them.
I linked to some posts about tank carrier calibration which may offer additional alternatives (the first of which are this thread and @Jens_Schnabel’s original videos - thanks for those!).
The latest suggestion of just allowing the build platform to lower and calibrating to that is interesting. Would love to hear how it worked out if you do it that way.