Crackling in right channel, what do I do? Help, please.

Sadly, I am experiencing crackling in the right channel of my system. The crackling happens intermittently and has happened on different sources, including my FM tuner, and from my DAC. It seems like the crackling is not related to the source. 

I have a monster of a system, including a Gryphon Colosseum amplifier, and a pair of Gryphon Cantata speakers. 

My system is described in the link below. How should I go about debugging this problem? Do I dare play the system? Should I buy a cheap amp and swap that in to see if the problem persists? Do I buy a cheap preamp as well? Do I start by swapping the speaker cables to the opposite speaker cables to see if the crackle moves to the other speaker? 

My system has been performing flawlessly for a number of years now. I did have to get cheap part replaced on the amplifier about three or four years ago, and used Soundsmith in Peekskill, NY.

I'm pretty brokenhearted about the possibility of having to get my system repaired. I had total hip replacement surgery two months ago and I can't lift anything. Moving the beast of an amp or the heavy speakers is out of the question. I suppose I could find somebody to help me if it comes to that. 

Sigh. 

Larry