Nad c-370: Right Channel drops out


I took my NAD to a local repair shop to investigate why the right channel goes out on my amp and they proposed to charge me $420 to install a main amp kit, a filter set plus labor. Needless to say, I paid them their $70 "diagnostic fee" and brought the Nad home, unrepaired.

I am a bit baffled because I can get the right channel to come on if I tinker around with the amp by switching source inputs form CD to Video and so on. I have been reading on the internet about problems with these amps due to capacitors overheating and bugging out. Is there a particular capacitors or group of capacitors that I could replace myslef and get my rig running again?
Ag insider logo xs@2xtbone1
If you contact NAD they will refer you to an authorized repair center and they should charge around $50 for the estimate. (You would have to pay shipping though.) I wouldn't mess w/it unless you really know what you are doing. Have you tried cleaning the balance, volumn and input switches? Also, it may be a loose solder joint. Good Luck!
I dunno what a "main amp kit" is...that's what they told my girlfriend is needed (plus a filter set.) I did not get to talk to the technician. The only one I got to talk to was the lady at the front desk who held me up for $70.