Hi , Re condensation inside the o/s headlight unit. - I had a similar problem on my 2008 Alphard's offside headlight unit. The easy fix, was as suggested using a hair dryer.
My suggested method, which worked this morning:
1.Remove the large blanking cap over the o/s headlight aperture. It's about 75mm wide unscrew and don't drop it. There is rubber seal ensure its in one piece. You can get condensation in the cap so wipe it out. This provides a vent out for the warm air you are about to put in.
2. I then connected a piece ( 15'' length) of standard water pipe hose to a funnel.
3. Now remove the o/s mainbeam lamp assembly - easy twist anticlockwise, I think, take out carefully, it should still be connected to the wiring still.
4.Insert the hose into the mainbeam aperture now left open by removing the lamp.
5. Use the hair dryer to blow warm air into the funnel which flows through the hose to the light assembly.
6. Water will evaporate off the assembly glass. I alternated from blowing the air in via the hose to carefully warming the outside glass with the hair dryer where I could see condensation. Took about 30 mins overall. Don't put too much heat on the outside glass just be aware of how long you leave it on for.
I watched the condensation disappear.
Hope this helps, and it is far easier than taking the headlight out. 🙂