Icepower 1200AS2 stop working

Hi,
I need some help.
I have a 1200AS2 module that stopped working.
Auxiliary and stby switching PSU is trying to start but after less than a second stop. That is all that I've found out without schematic. No visual demage is present on the board.
Is here anybody who has any experience in repairing this modules or has a service documentation to share?