I replaced the jetways at gates 3-51 (1, A1, and 2 have static non-removable jetways). I also re-positioned the ground equipment and re-aligned the parking positions. I tested with the PMDG 737 NGX, 747-400F, and 777. Detailed instructions and notes are in KSAN GSX2 Readme.txt.
I still have to select Add-ons/Couatl settings/"Restart Couatl and rebuild airport cache" from the menu to get the jetways to appear most of the time. It worked briefly after one of the updates, but the issue came back. Restart and rebuild always works for me, though.