Danny T,
Although I haven't done this myself, I did find a possibly useful article (not mine) here:
https://inthegaragemedia.com/ctp-may-2021-chevs-interior/It doesn't detail the underdash work involved in removing the regulator once you have managed to get it disconnected from the windshield, but may be helpful with the steps needed before removal.
Another thing you might find useful is this Tech Tip written by member "Kip Bonds" (Kip's41) posted back in 2007
Windshield Crank RebuildAm sure that others will come along and add their experience and knowledge to help you with your task.
Maybe you can post more about your progress (with some

please) as it could prove helpful to the next 'Bolter needing to do this repair too.
Looking forward to seeing how this turns out.

Dan
