Hi everyone....so I'm a new owner of a used Boxster. I've an issue and I want to learn how to fix my Boxster with the purpose that I will keep this little beast for some time

It's a 2000 2.7L Tiptronic and has 70K in it.
The right door window glass will smoothly drop while opening the door from the inner handle to go out of the car. The window smoothly opens and closes however when I try to open the door from outer door handle the glass will no drop. Sometime the glass drops and goes up very fast before I open the door. Sometimes it will just function normally. Most of the time the glass will not respond. I have tried every way to open the door but it's not helping me. Please note that I can easily open and close the left door on the driver side with no problem.... it's not a door balance issue
I'm determined to open the window and replace the parts. I saw an issue about door handle "tumbler" in Boxster 101 Project but I'm not clear which part is that.
I learn from 986Forum and Pelican Parts that I need to replace this:
996 613 126 00
996-537-445-02
Someone please help me why my outer door handle is not activating the glass to drop while opening the door? What parts do I need to replace?
Thank you