Denon AVR 1708 power off problems, schematics?

[rollemolle]

Didn't get much help from Denon service/support in Denmark, so I'm hoping someone might be able and willing to help me fix the problem with the receiver shutting down after about a minute.
The powersupply has two small heatsinks which quickly get hot and shuts down the receiver and the power light is then blinking red.

AVR 1708 SUPPLY B´D
7020-06595-101-1S