Smoking from my amp?

Hi,
I have a six channel amp that worked fine until I put it in the box five months ago for building a new room. Last night, I connected all my speakers to it and the left channel didn't work.
After turned on and off a few times to check for which one was damaged (speaker, cable or amp), I saw smoke coming out from the amp and smell something burn.
I opened the cover and see two fuses were blown, but didn't see any burned parts. I plan to replace the fuses and hook it up again. However, my friend told me that's not a good ideas because smoking and smelling burn that mean some parts already burned. He recommend me sending the amp to manufacture for repair because the damaged is more than the blowing fuses. Acording to him, blowing fuses doesn't create smoke, and hook it up again create more damaged.
So, should I replace the fuses and turn the amp on again before seding it for repair? Please advice me
Thank you very much.
DT