Advice Needed On Recapping Power Amp

Hi   @kosst_amojan    ....  Well, I guess that really depends quite a bit about your transformer first. My knowledge is limited about "Inrush" current.  
To those reading these comments.. In-rush current is the current flow into a product when you flip on the power switch.  It can be quite large.  That is why on some of these old beast of an amplifier, you see the lights dim when you fire them up. 
I am not a indepth as some others, but as I understand it,  the larger the transformer, especially in toroid types are more susceptible in passing current. When caps are idle,  they look like a dead short,  So the VERY IMPORTANT part here is.... The Low esr along with natural wire resistance is the only filter for this current (unless there is a soft start circuit)... I have done this to maybe 5 or 6 amplifiers.  NEVER had an issue.  Each time, the amp sounded better, but I yield to opinions of those in the know. 

recap not needed. don't waste time.

Going to higher capacitance means also higher inductance hence slower response to rapid current demand.   It will also reduce ripple and that might not be a good thing, since very low ripple, especially when combined with low ESR means very high and very narrow current spikes charging capacitors and that might couple to any inductance in the rest of the circuit.  I would agree with  kosst_amojan and would not try on my own to redesign an amp.  In some cases it might work in other it could make it worse (or damage rectifier).

Bypassing slow large inductive caps with fast low ESR cap might be not the best idea, since it creates parallel resonance circuit that might ring.  Better option would be to get low inductance electrolytic caps (like slit foil type), but they are expensive.  Better yet is not to "redesign" something that works just fine.  There is also an issue of reselling such "improved" amp.

15 year old capacitors, unless they are in very warm place, should be good for another decade.

Kijanki,
    I've never claimed to be the sharpest tool in the shed, but as said above, I've done this many times. I have only had positive results.  How do propose that you get parasitic inductance introduced in a properly designed power supply?  The only issue that I can see is a poor excuse of rectifier. As long as you bridge is rated for the current you should be fine and An ideal cap has zero inductance or resistance on its own. 

@rlb61     after all of this, I'm sure that you'll decide not to recap, but as we have all state, not really needed at this point.