I just upgraded to 5.2 and when I reinstalled the L1011 but before installing Paul's gauge, my last entry was:

[Sound.651]
;cargo door main
File=cargo_door.wav
Id=3700026
Volume=0.5

So, I had to renumber the V-One additions to the config file beginning with 652. My old config file I had saved started at 648, too, so not sure where I picked up four extras, but it would not work until I changed it. Now it works in 5.2. (Still have to make sure the path is right, though, as described in the other thread.) Now I'm going to try to figure out what I did wrong with the Total Overhaul mod for the 737-200 in 5.2, because I had it working in 5.1.