When to recap a late nineties Krell Kav 250 A.

Greetings everyone. I have a Krell 250A which bought used in 1998 and to me it works just fine. The original owner had it for about 2 months.

I have heard that you have to recap the amp at some point, however I can not hear any degradation in sound. I did replace some fuses and failed to see if the caps are swollen or leaking. The amp has always been connected to a Tice Power Conditioner and sometimes I don't listen to it for a weeks or longer. My wife and I travel a bit and I just unplug it. Suggestions?? 

While we are at it, I have heard that Krell may be filing for Bankruptcy and may not be able to get parts or service in case it's needed. Thanks in advance and best regards. 
Post removed 
pivetta, why not buy a Peak cap checker and measure the existing caps in your amp. Rather than relying on opinion, will give you hard data for each cap on capacitance value, and ESR.....once you have that data, then it will be an automatic and valid answer to your question....