What FDE are you using?

Ask over at TSS, I don't own Audio Environment therefore I don't test the models with it.

Next time please open a new thread.
As for your question, there is no VC as this is not a user aircraft so it is not meant to be flown by you the user so no support in regards to this "issue".

Winglets light is coupled to the cabin lights in the model level and not alpha controlled, in FSX the cabin light remain on as long as the navigational lights are on.
After 15 minutes the cabin light should turn off and with them the cabin lights.

Like was said many times the classics are leaving NAX's fleet and therefore you probably wont find a painter willing to paint them.

Would eventually happen some day.

No.

Make sure you have the latest PK and even try and download again. Copy the alpha channel from the FS9 PK directly into your repaint and test in FS9 again. This is how I fixed the paint drpilot900's sent me for checking, it seems the alpha is somehow wrong and is not totally black but actually only 9...

You could upload them (dropbox,mediafire) and send a link by email or try to attach them to an email then send them to:
contact@fsxaibureau.com

The best way is to share one of your paints and see if this issue is isolated to your system or not.

This is a bug in P3DV2 wait for 2.1

If you have the SP2 737NG models you can remove both lightmaps just make sure you have a copy of the lightmaps in your main Flight Simulator texture folder.

Please upload your repaint for test or send it to contact@fsxaibureau.com.

This paints package has two problems 1. the FSX lightmap is wrong, it is made in an AIA FSX models manner which is incorrect for FAIB FSX models 2. there is a problem with OB-1854-P, its texture folder reads texture.OB-1 9 54-P which is probably the issue you are seeing. It is most likely something ...

Can you link to the paints here?