When to get your amp up graded caps ???

I have no idea how it sounded when it was new, that would have been nice... but have enjoyed it since it's been in my system... contacting Audio Classics would be a good idea...I guess when you become audio obsessed we worry about too many things, but you want the best you can get, with what you got...
Thanks...

Mike at AudioClassics says the amp was checked out at the time of sale, and that if anything needed replacing, it would have been replaced at that time... So may I rest in "audio peace" thanks to all....