So if the heat would be the problem could I find a way to install a silent fan or two inside the receiver's chassis?Right over the vent. I could have the fans mounted inside and have an outboard switch to turn them on outside the case. I would make it to where if needed they can be removed without ever telling they were there.(meaning no screws and/or making any permanent change to the chassis) because I would hate to lose my warranty

This would be the same concept as putting fans into a computer's chassis, which I have done before.
I believe if heat is the main concern it is tweakable to work. I've noticed that receiver needs a fan anyway. It stays pretty warm.
Any input on this suggestion would be awesome.