Gentlemen:

I have a Pioneer VSX-452 whose radio has been playing like crap for the past few years. All other power components work fine; I'm operating a CD changer, dual tape, a turntable and two sets of speakers off of it.
Question: would it help to perform some form of maintenance on the circuitry or somesuch to increase the audio response from the AM/FM tuner? If so, could you direct me to the proper documentation to perform this task?

Mark