Thanks for reminding me about that. I forgot to do it .Let's take it one step further. In the 3 years after which Kris noticed some creeping harshness, has he ever cleaned his interconnect wire and speaker terminations (w Caig's DeoxIT or equivalent)? It has long been recommended (by HP and others) that audiophiles do this once per year. You might try that and see if it makes a difference.
I think last time I did it it was 3 years ago before I got extreme.
What solution is the highest recommendation for cleaning ?