Whats going on with this Vaillant F73 - F76 part 1

I was called to repair this boiler, inside the case there are signs of foul play! This is now a familiar seen, let me open the combustion chamber .. you have to look inside see link:

http://youtu.be/FEy3f84n8Fk
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Видео Whats going on with this Vaillant F73 - F76 part 1 канала unicuk