I recently had another window regulator break on my 2001 Pontiac Grand Prix. In order to prevent this from happening again, I decided to just take off all four door panels and thoroughly lubricate the window tracks and the regulators.
I took pictures of the process and created a quick guide.
Here's the gallery -
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I hope someone finds it to be useful.
Cheers, Paul Michaels Ft. Lauderdale, FL