If you have check the fuses and everything is ok, then the output transistors may be damaged and you need to take it to service, do not play with it, it will be too expensive if you do more damage, those receivers are very valuable these days, do not take a chance and send it to repair.
Furthermore I assume that you are not a service technician otherwise you will not be asking this question and if you are not a technician I can't tell you the procedure to fix it because maybe you won't understand or won't have the tools to do it.
Hope this helps a little.
Technician
Over 30 Years experience in Audio Electronics , Car Audio, Home and Audiophile Stereo Repair Service