Looking for Denon AVR-1906 / 768 Schematics

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hi there people
im new to this site
but im really hoping someone can help me with the problem i have
everything is good in stereo mode but when i switch to 5.1
everything is ok until i change function or change it back from 5.1 to stereo
i get a rather loud and annoying thump from the centre channel and if you was to watch it when it made the thump the cone comes right out and sort of suck right back in then its fine until i make the switch again?

so i phoned denon and explained to them and they said it could be the centre channel output transistors?

please please please
any help would be appreciated
and a thanks in advance

oh and also getting the thump from centre pre out
 
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