Upgrading Quicksilver preamp or amp caps -- warranty impact?

Considering upgrading caps in my Quicksilver line stage and 60wpc monoblocks.

Looking for experiences from people who have done this.

Did it make a difference?
Did you do it while under warranty?
Did you try seeking Mike’s permission to do that so warranty could remain intact?
Any negatives in your experience?
Thanks.

P.S. If you did this with OTHER gear, your experiences are welcome.