Need Help repairing my Audio interface

Hi there, 

              I have an audio interface (UAD apollo twin mkii). Unfortunately I over heated it while working.  

First time:-  I put cloth on it while it was running and left the room. When I came back and touched the body (which is made of alominuim i guess) was hot like an iron. Anyhow i turned it off immediately and later started it and apprently it started working but, I noticed some degradation in audio quality. 

I want to repair it myself. I think may be something went wrong with opamps or resistors got burned or something? Any suggesstions please.