I'm not surprised, given the very limited access. The thing that really sucks about this job is that I'll probably have to completely remove the regulator, hopefully be able to diagnose whether the problem is with the regulator vs. the motor, then I'll have to put everything back together while waiting for whichever part it turns out to be, and then take it all apart again to replace the part. And I'm not 100% convinced I'll be able to unambiguously determine which component is the one that's faulty. For those who have gone through a similar problem, it is obvious when the motor is bad? It's having no problem sending the window down; it just can't lift it up, but I can't tell if it's because the motor is weak, or if the regulator mechanism is binding somewhere.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT