If you're looking to have the 3910 modded, seriously check out Alex Pechev's mods. I THINK his URL is www.aplhifi.com. His mods do wonders for the unit, though they aren't cheap.
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Vibration has been an issue with the Denon 2900 and Denon 3910,
although it is much improved in the Denon 3910. Generally, though, any
vibration does not adversely affect the operation of the units, although it
can be a little freaky to observe.
The problem you describe seems abnormal, and is perhaps an issue best
examined by a qualified service technician...especially before you invest
more money in the unit by having it modified (and voiding the warranty).